Thread Safety Analysis: Fix implicit member access in attributes (#194457) SExprBuilder previously translated DeclRefExprs referring to FieldDecls as plain global references (til::LiteralPtr), ignoring the base object. This caused false positives when members were accessed implicitly (such as in C, or parameter attributes in C++) because the context of the parent object was lost. Fix this by using translateCXXThisExpr() to evaluate SelfArg into a base expression when translating a DeclRefExpr to a FieldDecl. This makes the analysis behave correctly for implicit member accesses in attributes. Assisted-by: Gemini 3 (for debugging and review)
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