Move predefine changes out of this PR.

Author: Prabhuk

clang/lib/Basic/Targets/OSTargets.cpp

@@ -260,7 +260,6 @@ static void addVisualCDefines(const LangOptions &Opts, MacroBuilder &Builder) {
 void addWindowsDefines(const llvm::Triple &Triple, const LangOptions &Opts,
                        MacroBuilder &Builder) {
   Builder.defineMacro("_WIN32");
-  Builder.defineMacro("__PECOFF__");
   if (Triple.isArch64Bit())
     Builder.defineMacro("_WIN64");
   if (Triple.isWindowsGNUEnvironment())

clang/lib/Basic/Targets/OSTargets.h

@@ -783,11 +783,7 @@ template <typename Target>
 class LLVM_LIBRARY_VISIBILITY UEFITargetInfo : public OSTargetInfo<Target> {
 protected:
   void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
-                    MacroBuilder &Builder) const override {
-    Builder.defineMacro("__PECOFF__");
-    Builder.defineMacro("__UEFI__");
-    // Builder.defineMacro("_WIN32");
-  }
+                    MacroBuilder &Builder) const override {}
 
 public:
   UEFITargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)