[clang] [webkit.UncountedLambdaCapturesChecker] Add a fallback for checking lambda captures (PR #119800)

[Rashmi Mudduluru via cfe-commits]

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@@ -61,6 +62,24 @@ class UncountedLambdaCapturesChecker
         return result && *result;
       }
 
+      bool VisitLambdaExpr(LambdaExpr *L) override {
+        if (LambdasToIgnore.contains(L))
+          return true;
+        Checker->visitLambdaExpr(L, shouldCheckThis());
+        return true;
+      }
+
+      bool VisitVarDecl(VarDecl *VD) override {
+        auto *Init = VD->getInit();
+        if (!Init)
+          return true;
+        auto *L = dyn_cast_or_null<LambdaExpr>(Init->IgnoreParenCasts());
+        if (!L)
+          return true;
+        LambdasToIgnore.insert(L); // Evaluate lambdas in VisitDeclRefExpr.
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t-rasmud wrote:

Not sure I understand this comment. `L` is a lambda that should be ignored. Is this saying it will be evaluated in `VisitDeclRefExpr` again?

https://github.com/llvm/llvm-project/pull/119800