[PGO][Offload] Don't define entrypoint on Darwin

Author: EthanLuisMcDonough

compiler-rt/lib/profile/InstrProfilingFile.c

@@ -1273,11 +1273,14 @@ COMPILER_RT_VISIBILITY int __llvm_profile_set_file_object(FILE *File,
   return 0;
 }
 
-COMPILER_RT_GPU_ENTRYPOINT int __llvm_write_custom_profile(
-    const char *Target, const __llvm_profile_data *DataBegin,
-    const __llvm_profile_data *DataEnd, const char *CountersBegin,
-    const char *CountersEnd, const char *NamesBegin, const char *NamesEnd,
-    const uint64_t *VersionOverride) {
+#ifdef COMPILER_RT_GPU_ENTRYPOINT
+int __llvm_write_custom_profile(const char *Target,
+                                const __llvm_profile_data *DataBegin,
+                                const __llvm_profile_data *DataEnd,
+                                const char *CountersBegin,
+                                const char *CountersEnd, const char *NamesBegin,
+                                const char *NamesEnd,
+                                const uint64_t *VersionOverride) {
   int ReturnValue = 0, FilenameLength, TargetLength;
   char *FilenameBuf, *TargetFilename;
   const char *Filename;
@@ -1379,5 +1382,6 @@ COMPILER_RT_GPU_ENTRYPOINT int __llvm_write_custom_profile(
 
   return ReturnValue;
 }
+#endif
 
 #endif

compiler-rt/lib/profile/InstrProfilingPort.h

@@ -43,7 +43,6 @@
 
 #if defined(__APPLE__)
 #define COMPILER_RT_SEG "__DATA,"
-#define COMPILER_RT_GPU_ENTRYPOINT COMPILER_RT_VISIBILITY
 #else
 #define COMPILER_RT_SEG ""
 #define COMPILER_RT_GPU_ENTRYPOINT