[ObjC] Output directive to disable clang-format on generated files.

Regenerate the WKTs accordingly.

objectivec/GPBAny.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/any.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -172,3 +174,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBAny.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/any.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBAny.pbobjc.h"
 
@@ -98,3 +100,5 @@ typedef struct GPBAny__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBApi.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/api.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -296,3 +298,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBApi.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/api.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBApi.pbobjc.h"
 
@@ -352,3 +354,5 @@ typedef struct GPBMixin__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBDuration.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/duration.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -131,3 +133,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBDuration.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/duration.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBDuration.pbobjc.h"
 
@@ -93,3 +95,5 @@ typedef struct GPBDuration__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBEmpty.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/empty.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -58,3 +60,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBEmpty.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/empty.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBEmpty.pbobjc.h"
 
@@ -69,3 +71,5 @@ typedef struct GPBEmpty__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBFieldMask.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/field_mask.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -259,3 +261,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBFieldMask.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/field_mask.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBFieldMask.pbobjc.h"
 
@@ -82,3 +84,5 @@ typedef struct GPBFieldMask__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBSourceContext.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/source_context.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -63,3 +65,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBSourceContext.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/source_context.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBSourceContext.pbobjc.h"
 
@@ -82,3 +84,5 @@ typedef struct GPBSourceContext__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBStruct.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/struct.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -190,3 +192,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBStruct.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/struct.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBStruct.pbobjc.h"
 
@@ -295,3 +297,5 @@ typedef struct GPBListValue__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBTimestamp.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/timestamp.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -162,3 +164,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBTimestamp.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/timestamp.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBTimestamp.pbobjc.h"
 
@@ -93,3 +95,5 @@ typedef struct GPBTimestamp__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBType.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/type.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -430,3 +432,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBType.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/type.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBType.pbobjc.h"
 
@@ -707,3 +709,5 @@ typedef struct GPBOption__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBWrappers.pbobjc.h

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/wrappers.proto
 
+// clang-format off
+
 #import "GPBDescriptor.h"
 #import "GPBMessage.h"
 #import "GPBRootObject.h"
@@ -205,3 +207,5 @@ CF_EXTERN_C_END
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

objectivec/GPBWrappers.pbobjc.m

@@ -1,6 +1,8 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/wrappers.proto
 
+// clang-format off
+
 #import "GPBProtocolBuffers_RuntimeSupport.h"
 #import "GPBWrappers.pbobjc.h"
 
@@ -441,3 +443,5 @@ typedef struct GPBBytesValue__storage_ {
 #pragma clang diagnostic pop
 
 // @@protoc_insertion_point(global_scope)
+
+// clange-format on

src/google/protobuf/compiler/objectivec/objectivec_file.cc

@@ -377,7 +377,9 @@ void FileGenerator::GenerateHeader(io::Printer* printer) {
       "\n"
       "#pragma clang diagnostic pop\n"
       "\n"
-      "// @@protoc_insertion_point(global_scope)\n");
+      "// @@protoc_insertion_point(global_scope)\n"
+      "\n"
+      "// clange-format on\n");
 }
 
 void FileGenerator::GenerateSource(io::Printer* printer) {
@@ -638,7 +640,9 @@ void FileGenerator::GenerateSource(io::Printer* printer) {
     "\n"
     "#pragma clang diagnostic pop\n"
     "\n"
-    "// @@protoc_insertion_point(global_scope)\n");
+    "// @@protoc_insertion_point(global_scope)\n"
+    "\n"
+    "// clange-format on\n");
 }
 
 // Helper to print the import of the runtime support at the top of generated
@@ -650,6 +654,8 @@ void FileGenerator::PrintFileRuntimePreamble(
   printer->Print(
       "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
       "// source: $filename$\n"
+      "\n"
+      "// clang-format off\n"
       "\n",
       "filename", file_->name());