[clang] [clang][rtsan] Introduce realtime sanitizer codegen and driver (PR #102622)

[Fangrui Song via cfe-commits]

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@@ -845,6 +845,15 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
   if (SanOpts.has(SanitizerKind::ShadowCallStack))
     Fn->addFnAttr(llvm::Attribute::ShadowCallStack);
 
+  if (SanOpts.has(SanitizerKind::Realtime)) {
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MaskRay wrote:

remove braces per https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

https://github.com/llvm/llvm-project/pull/102622