Fix printer.h compile error in -std=c++2b (#12870)

Closes #12869

Closes #12870

COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/12870 from lukeocamden:patch-1 28bd987181
PiperOrigin-RevId: 534717297

src/google/protobuf/io/printer.cc

@@ -277,6 +277,8 @@ Printer::Format Printer::TokenizeFormat(absl::string_view format_string,
 
 constexpr absl::string_view Printer::kProtocCodegenTrace;
 
+Printer::Printer(ZeroCopyOutputStream* output) : Printer(output, Options{}) {}
+
 Printer::Printer(ZeroCopyOutputStream* output, Options options)
     : sink_(output), options_(options) {
   if (!options_.enable_codegen_trace.has_value()) {
@@ -289,6 +291,10 @@ Printer::Printer(ZeroCopyOutputStream* output, Options options)
   }
 }
 
+Printer::Printer(ZeroCopyOutputStream* output, char variable_delimiter,
+                 AnnotationCollector* annotation_collector)
+    : Printer(output, Options{variable_delimiter, annotation_collector}) {}
+
 absl::string_view Printer::LookupVar(absl::string_view var) {
   auto result = LookupInFrameStack(var, absl::MakeSpan(var_lookups_));
   ABSL_CHECK(result.has_value()) << "could not find " << var;

src/google/protobuf/io/printer.h

@@ -518,7 +518,7 @@ class PROTOBUF_EXPORT Printer {
 
   // Constructs a new Printer with the default options to output to
   // `output`.
-  explicit Printer(ZeroCopyOutputStream* output) : Printer(output, Options{}) {}
+  explicit Printer(ZeroCopyOutputStream* output);
 
   // Constructs a new printer with the given set of options to output to
   // `output`.
@@ -528,8 +528,7 @@ class PROTOBUF_EXPORT Printer {
   //
   // Will eventually be marked as deprecated.
   Printer(ZeroCopyOutputStream* output, char variable_delimiter,
-          AnnotationCollector* annotation_collector = nullptr)
-      : Printer(output, Options{variable_delimiter, annotation_collector}) {}
+          AnnotationCollector* annotation_collector = nullptr);
 
   Printer(const Printer&) = delete;
   Printer& operator=(const Printer&) = delete;