[ObjC] Remove GPBDataType_Count, was internal to the runtime

and never really used.

PiperOrigin-RevId: 718078561

objectivec/GPBRuntimeTypes.h

@@ -102,15 +102,6 @@ typedef NS_ENUM(uint8_t, GPBDataType) {
   GPBDataTypeEnum,
 };
 
-enum {
-  /**
-   * A count of the number of types in GPBDataType. Separated out from the
-   * GPBDataType enum to avoid warnings regarding not handling GPBDataType_Count
-   * in switch statements.
-   **/
-  GPBDataType_Count = GPBDataTypeEnum + 1
-};
-
 /** An extension range. */
 typedef struct GPBExtensionRange {
   /** Inclusive. */

objectivec/GPBWireFormat.m

@@ -39,7 +39,7 @@ GPBWireFormat GPBWireFormatForType(GPBDataType type, BOOL isPacked) {
     return GPBWireFormatLengthDelimited;
   }
 
-  static const GPBWireFormat format[GPBDataType_Count] = {
+  static const GPBWireFormat format[] = {
       GPBWireFormatVarint,           // GPBDataTypeBool
       GPBWireFormatFixed32,          // GPBDataTypeFixed32
       GPBWireFormatFixed32,          // GPBDataTypeSFixed32