[mlir] Remove unused local variables (NFC)#138481

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

kazutakahirata:cleanup_001_tidy_bugprone-unused-local-non-trivial-variable_mlirkazutakahirata/llvm-project:cleanup_001_tidy_bugprone-unused-local-non-trivial-variable_mlirCopy head branch name to clipboard