[clang] [clang] Constant-evaluate format strings as last resort (PR #135864)

[via cfe-commits]

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@@ -17945,15 +17945,36 @@ bool Expr::tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx,
 
 static bool EvaluateBuiltinStrLen(const Expr *E, uint64_t &Result,
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cor3ntin wrote:

We probably want to rename that method to `EvaluateCString` or something like that given how we use it

https://github.com/llvm/llvm-project/pull/135864