Fix a crash caused by an invalid expression in the atomic capture clause, due to the `checkForSymbolMatch` function not accounting for `GetExpr` potentially returning null. Fix https://github.com/llvm/llvm-project/issues/139884
Fix a crash caused by an invalid expression in the atomic capture clause, due to the `checkForSymbolMatch` function not accounting for `GetExpr` potentially returning null. Fix https://github.com/llvm/llvm-project/issues/139884