[clang] fix crash when template with constructor attribute is instantiated without a priority (#169282) fixes: https://github.com/llvm/llvm-project/issues/169072 The current implementation expects the priority argument to be provided to `[[gnu::constructor(<priority>)]]`, but the argument is really optional. This was causing a segfault when instantiating the function-template because we were trying to fold an `Expr*` that was a nullptr. This change skips the evaluation of the priority argument when it is missing; this will instantiate a function declaration with the default priority (65535).
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