[clang] Add ability for clang-format-diff to exit with non-0 status (PR #70883)

https://github.com/conrad-donahue updated https://github.com/llvm/llvm-project/pull/70883 >From 646cabcf167facb63c78277b50ea62afbc61b3c0 Mon Sep 17 00:00:00 2001 From: Conrad Donahue Date: Tue, 31 Oct 2023 21:55:27 -0400 Subject: [PATCH 1/2] Add ability for clang-format-diff to exit with non-0

[clang] Add ability for clang-format-diff to exit with non-0 status (PR #70883)

https://github.com/conrad-donahue created https://github.com/llvm/llvm-project/pull/70883 This patch adds the ability for the clang-format-diff script to exit with a non-zero status if it detects that formatting changes are necessary. This makes it easier to use clang-format-diff as part of a