[clang] [sanitizer] Parse weighted sanitizer args and -fno-sanitize-top-hot (PR #121619)

[Thurston Dang via cfe-commits]

================
@@ -3615,9 +3616,12 @@ void CodeGenFunction::EmitCheck(
 
     if (!CGM.getCodeGenOpts().SanitizeMergeHandlers.has(Checked[i].second))
       NoMerge = true;
+
+    if (!CGM.getCodeGenOpts().NoSanitizeTopHot.has(Checked[i].second))
+      SanitizeGuardChecks = true;
   }
 
-  if (ClSanitizeGuardChecks) {
+  if (SanitizeGuardChecks) {
     llvm::Value *Allow =
         
Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::allow_ubsan_check),
                            llvm::ConstantInt::get(CGM.Int8Ty, CheckHandler));
----------------
thurstond wrote:

Instead of passing CheckHandler, can I pass the sanitizer cutoff threshold 
instead?

Something like
```
        Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::allow_ubsan_check),
                           llvm::ConstantInt::get(CGM.Int8Ty, 
NoSanitizeTopHot[someIndex]));
```

https://github.com/llvm/llvm-project/pull/121619
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