Fix -DCOMPILER_RT_HWASAN_WITH_INTERCEPTORS=OFF regression

[thurston]

Summary

This applies the fix as suggested by Gelbpunkt in https://github.com/llvm/llvm-project/issues/64730,

Thanks to Florian Mayer for pointing out that my earlier patch D151262
had caused this regression.

[fmayer]

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

523

I think we want to keep that as is, but move the InitializeCommonInterceptors into it (and add back the (void)(InitializeCommonInterceptors). Otherwise we will get the unused warnings that the voids are preventing

[fmayer]

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

523

Maybe my wording isn't great. I meant

  (void)(InitializeCommonInterceptors);
  (void)(read_iovec);
  (void)(write_iovec);

#  if HWASAN_WITH_INTERCEPTORS
  InitializeCommonInterceptors();
  [...]

[fmayer]

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

523

I should have properly read the error in the bug. My mistake. Nevermind me.

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

 }  // namespace __hwasan
 
 namespace __hwasan {
 
 void InitializeInterceptors() {
   static int inited = 0;
   CHECK_EQ(inited, 0);
 
+#  if HWASAN_WITH_INTERCEPTORS
   InitializeCommonInterceptors();
 
   (void)(read_iovec);
   (void)(write_iovec);
 
-#  if HWASAN_WITH_INTERCEPTORS
 #    if defined(__linux__)
   INTERCEPT_FUNCTION(__libc_longjmp);
   INTERCEPT_FUNCTION(longjmp);
   INTERCEPT_FUNCTION(siglongjmp);
   INTERCEPT_FUNCTION(vfork);
 #    endif  // __linux__
   INTERCEPT_FUNCTION(pthread_create);
   INTERCEPT_FUNCTION(pthread_join);