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

[Vitaly Buka via cfe-commits]

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@@ -186,10 +188,24 @@ struct SanitizerSet {
 /// Returns a non-zero SanitizerMask, or \c 0 if \p Value is not known.
 SanitizerMask parseSanitizerValue(StringRef Value, bool AllowGroups);
 
+/// Parse a single weighted value (e.g., 'undefined=0.05') from a -fsanitize= or
+/// -fno-sanitize= value list.
+/// Returns a non-zero SanitizerMask, or \c 0 if \p Value is not known.
+/// The relevant weight(s) are updated in the passed array.
+/// Individual Cutoffs are never reset to zero unless explicitly set
+/// (e.g., 'null=0.0').
+SanitizerMask parseSanitizerWeightedValue(StringRef Value, bool AllowGroups,
+                                          SanitizerMaskCutoffs *Cutoffs);
+
 /// Serialize a SanitizerSet into values for -fsanitize= or -fno-sanitize=.
 void serializeSanitizerSet(SanitizerSet Set,
                            SmallVectorImpl<StringRef> &Values);
 
+/// Serialize a SanitizerMaskCutoffs into values for -fsanitize= or
+/// -fno-sanitize=.
+void serializeSanitizerMaskCutoffs(const SanitizerMaskCutoffs Cutoffs,
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vitalybuka wrote:

`const SanitizerMaskCutoffs&`

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