[AMDGPU] Simplify template metaprogramming in IsMCExpr##member (NFC)#160005

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

kazutakahirata:cleanup_20250921_10TMP_AMDGPU_IsMCExpr_memberkazutakahirata/llvm-project:cleanup_20250921_10TMP_AMDGPU_IsMCExpr_memberCopy head branch name to clipboard