Thread Safety Analysis: Optimize LocalVariableMap's canonical reference computation (#161600) We observed slowdowns in auto-generated million+ line C++ source files due to recent fixes to LocalVariableMap. Rather than recompute the canonical underlying non-reference VarDefinition every time we need to perform variable definition intersection at CFG merge points, pre-compute the canonical references once on construction. Ensure to maintain the invariant that if both the direct and canonical reference are being invalidated, both become 0. Reported-by: Bogdan Graur <bgraur@google.com>
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