Move two Darwin-specific hacks into #ifdef __APPLE__. These were stat'ing

nonexistent Darwin-specific files on every module build.

llvm-svn: 182331

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1690,6 +1690,7 @@ std::string CompilerInvocation::getModuleHash() const {
                       hsOpts.UseStandardCXXIncludes,
                       hsOpts.UseLibcxx);
 
+#ifdef __APPLE__
   // Darwin-specific hack: if we have a sysroot, use the contents and
   // modification time of
   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
@@ -1710,6 +1711,7 @@ std::string CompilerInvocation::getModuleHash() const {
         code = hash_combine(code, statBuf.st_mtime);
     }
   }
+#endif
 
   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
 }