[ASTMatchers] Use llvm::is_detected (NFC)#137560

kazutakahirata merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_001_is_detected_clang_has_getDeclkazutakahirata/llvm-project:cleanup_001_is_detected_clang_has_getDeclCopy head branch name to clipboard