[clang] [llvm] [LFI][X86] Add X86 LFI target and system instruction rewrites (PR #189569)

[Fangrui Song via llvm-commits]

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@@ -534,6 +534,10 @@ void X86TargetInfo::getTargetDefines(const LangOptions &Opts,
     DefineStd(Builder, "i386", Opts);
   }
 
+  if (getTriple().isLFI()) {
+    Builder.defineMacro("__LFI__");
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MaskRay wrote:

drop braces when you reland

https://github.com/llvm/llvm-project/pull/189569