[InstrProf] Ignore -Wcast-qual after D153911 to fix build failure (NFC)

/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:46:60: error: cast from 'const char *' to 'struct __llvm_profile_header *' drops const qualifier [-Werror,-Wcast-qual]
  __llvm_profile_header *Header = (__llvm_profile_header *)ProfileData;
                                                           ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:49:30: error: cast from 'const char *' to 'struct __llvm_profile_data *' drops const qualifier [-Werror,-Wcast-qual]
      (__llvm_profile_data *)(ProfileData + sizeof(__llvm_profile_header) +
                             ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:77:41: error: cast from 'const struct __llvm_profile_data *' to 'struct __llvm_profile_data *' drops const qualifier [-Werror,-Wcast-qual]
       DstData = (__llvm_profile_data *)__llvm_profile_begin_data();
                                        ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:109:60: error: cast from 'const char *' to 'struct __llvm_profile_header *' drops const qualifier [-Werror,-Wcast-qual]
  __llvm_profile_header *Header = (__llvm_profile_header *)ProfileData;
                                                           ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:116:30: error: cast from 'const char *' to 'struct __llvm_profile_data *' drops const qualifier [-Werror,-Wcast-qual]
      (__llvm_profile_data *)(ProfileData + sizeof(__llvm_profile_header) +
                             ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:129:40: error: cast from 'const struct __llvm_profile_data *' to 'struct __llvm_profile_data *' drops const qualifier [-Werror,-Wcast-qual]
      DstData = (__llvm_profile_data *)__llvm_profile_begin_data(),
                                       ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:179:34: error: cast from 'const char *' to 'struct ValueProfData *' drops const qualifier [-Werror,-Wcast-qual]
    VPMergeHook((ValueProfData *)SrcValueProfData, DstData);
                                 ^
/data/llvm-project/compiler-rt/lib/profile/InstrProfilingMerge.c:181:46: error: cast from 'const char *' to 'struct ValueProfData *' drops const qualifier [-Werror,-Wcast-qual]
        SrcValueProfData + ((ValueProfData *)SrcValueProfData)->TotalSize;
                                             ^
...

compiler-rt/lib/profile/InstrProfilingFile.c

@@ -649,7 +649,14 @@ static void initializeProfileForContinuousMode(void) {
 static const char *DefaultProfileName = "default.profraw";
 static void resetFilenameToDefault(void) {
   if (lprofCurFilename.FilenamePat && lprofCurFilename.OwnsFilenamePat) {
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
     free((void *)lprofCurFilename.FilenamePat);
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
   }
   memset(&lprofCurFilename, 0, sizeof(lprofCurFilename));
   lprofCurFilename.FilenamePat = DefaultProfileName;
@@ -691,13 +698,20 @@ static int parseFilenamePattern(const char *FilenamePat,
   int MergingEnabled = 0;
   int FilenamePatLen = strlen(FilenamePat);
 
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
   /* Clean up cached prefix and filename.  */
   if (lprofCurFilename.ProfilePathPrefix)
     free((void *)lprofCurFilename.ProfilePathPrefix);
 
   if (lprofCurFilename.FilenamePat && lprofCurFilename.OwnsFilenamePat) {
     free((void *)lprofCurFilename.FilenamePat);
   }
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 
   memset(&lprofCurFilename, 0, sizeof(lprofCurFilename));
 

compiler-rt/lib/profile/InstrProfilingMerge.c

@@ -38,6 +38,11 @@ uint64_t lprofGetLoadModuleSignature(void) {
          __llvm_profile_get_magic();
 }
 
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
 /* Returns 1 if profile is not structurally compatible.  */
 COMPILER_RT_VISIBILITY
 int __llvm_profile_check_compatibility(const char *ProfileData,
@@ -183,3 +188,7 @@ int __llvm_profile_merge_from_buffer(const char *ProfileData,
 
   return 0;
 }
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif

compiler-rt/lib/profile/InstrProfilingValue.c

@@ -59,7 +59,14 @@ COMPILER_RT_VISIBILITY void lprofSetMaxValsPerSite(uint32_t MaxVals) {
 COMPILER_RT_VISIBILITY void
 __llvm_profile_set_num_value_sites(__llvm_profile_data *Data,
                                    uint32_t ValueKind, uint16_t NumValueSites) {
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
   *((uint16_t *)&Data->NumValueSites[ValueKind]) = NumValueSites;
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 }
 
 /* This method is only used in value profiler mock testing.  */