[alpha.webkit.UncountedLocalVarsChecker] Warn the use of a raw pointer/reference when the guardian variable gets mutated. (#113859) This checker has a notion of a guardian variable which is a variable and keeps the object pointed to by a raw pointer / reference in an inner scope alive long enough to "guard" it from use-after-free. But such a guardian variable fails to flawed to keep the object alive if it ever gets mutated within the scope of a raw pointer / reference. This PR fixes this bug by introducing a new AST visitor class, GuardianVisitor, which traverses the compound statements of a guarded variable (raw pointer / reference) and looks for any operator=, move constructor, or calls to "swap", "leakRef", or "releaseNonNull" functions.
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