Implement Git hook for clang-formatting

[dorde-antic]

Motivation

Resolves https://github.com/ROCm/rocMLIR-internal/issues/1882

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull Request Overview

This PR implements a Git pre-commit hook for clang-formatting C/C++ files. It adds a Python utility to handle clang-format operations and integrates it into the existing pre-commit hook workflow.

• Adds a new Python utility (clangformat.py) that wraps git-clang-format functionality
• Updates the pre-commit hook to run clang-format on C/C++ files in addition to the existing yapf formatting for Python files
• Adds error handling and validation for required tools (yapf and clang-format)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
mlir/utils/widgets/clangformat.py	New Python utility providing clang-format integration with Git workflow
.githooks/pre-commit	Updated pre-commit hook to include clang-format execution and improved tool validation

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[Copilot]

The hardcoded path '/opt/rocm/llvm/bin' makes this code non-portable across different environments. Consider making this configurable through environment variables or command-line arguments, with this as a fallback default.

[Copilot]

Git commands lack error handling. If git is not available or not in a git repository, subprocess.check_output will raise CalledProcessError with unclear error messages for users.