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

[Vitaly Buka via cfe-commits]

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@@ -26,6 +26,8 @@ class SanitizerArgs {
   SanitizerSet RecoverableSanitizers;
   SanitizerSet TrapSanitizers;
   SanitizerSet MergeHandlers;
+  SanitizerSet TopHot;
+  SanitizerMaskWeights TopHotWeights = {0};
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vitalybuka wrote:

It's not `Weight`, it's `cutoff threshold`.

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