[clang] [llvm] [clang][ubsan] Switch UBSAN optimization to `llvm.allow.{runtime,ubsan}.check()` (PR #84858)

[Vitaly Buka via cfe-commits]

================
@@ -3805,6 +3812,12 @@ void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked,
                                     SanitizerHandler CheckHandlerID) {
   llvm::BasicBlock *Cont = createBasicBlock("cont");
 
+  if (ClSanitizeExpHot) {
+    Checked =
+        Builder.CreateOr(Checked, Builder.CreateCall(CGM.getIntrinsic(
+                                      llvm::Intrinsic::experimental_hot)));
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vitalybuka wrote:

Thanks, Added TODO, will do in followup patches.
In this patch I'd like just switch approach.

https://github.com/llvm/llvm-project/pull/84858
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