[clang] [clang] Introduce a new UEFI target predefine. (PR #111719)

[via cfe-commits]

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@@ -259,6 +259,7 @@ static void addVisualCDefines(const LangOptions &Opts, MacroBuilder &Builder) {
 
 void addWindowsDefines(const llvm::Triple &Triple, const LangOptions &Opts,
                        MacroBuilder &Builder) {
+  Builder.defineMacro("__UEFI__");
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Prabhuk wrote:

Removed it from Windows target.

https://github.com/llvm/llvm-project/pull/111719