Enable TSan validation to detect when a mutable accessor of a message…

… is called concurrently with another accessor on the same message, which is a data race.

This is the third phase, in which we enable validation for string fields.

PiperOrigin-RevId: 544078735

src/google/protobuf/port_def.inc

@@ -864,11 +864,11 @@ static_assert(PROTOBUF_ABSL_MIN(20230125, 3),
 // fields/maps, enum/primitive fields, string fields, message fields.
 #define PROTOBUF_TSAN_READ_REPEATED(addr) PROTOBUF_TSAN_READ(addr)
 #define PROTOBUF_TSAN_READ_PRIMITIVE(addr) PROTOBUF_TSAN_READ(addr)
-#define PROTOBUF_TSAN_READ_STRING(addr)
+#define PROTOBUF_TSAN_READ_STRING(addr) PROTOBUF_TSAN_READ(addr)
 #define PROTOBUF_TSAN_READ_MESSAGE(addr)
 #define PROTOBUF_TSAN_WRITE_REPEATED(addr) PROTOBUF_TSAN_WRITE(addr)
 #define PROTOBUF_TSAN_WRITE_PRIMITIVE(addr) PROTOBUF_TSAN_WRITE(addr)
-#define PROTOBUF_TSAN_WRITE_STRING(addr)
+#define PROTOBUF_TSAN_WRITE_STRING(addr) PROTOBUF_TSAN_WRITE(addr)
 #define PROTOBUF_TSAN_WRITE_MESSAGE(addr)
 
 #ifdef PROTOBUF_USE_TABLE_PARSER_ON_REFLECTION