[clang-tools-extra] [clang-tidy] Fix false negatives in performance-faster-string-find with libstdc++ (PR #185559)

[via cfe-commits]

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@@ -136,3 +154,12 @@ int Macros() {
   // CHECK-MESSAGES: [[@LINE-1]]:10: warning: 'find' called with a string literal
   // CHECK-MESSAGES: [[@LINE-2]]:37: warning: 'find' called with a string literal
 }
+
+void IteratorInLibStdCXX() {
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zeyi2 wrote:

This is not exactly the same repro in the original issue, but I verify that it also causes a FN.

libstdc++: https://godbolt.org/z/YzvbTWafc
libc++: https://godbolt.org/z/ssYvohGGf

https://github.com/llvm/llvm-project/pull/185559