[CodeGen] Remove an obsolete macro test (NFC)#155069

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

kazutakahirata:cleanup_20250822_GNUC_CodeGen_TypeTraitsTestkazutakahirata/llvm-project:cleanup_20250822_GNUC_CodeGen_TypeTraitsTestCopy head branch name to clipboard