[llvm] [libcxx] Add pre-commit hooks and git config for libc++ & git-clang-format. (PR #73798)

[Louis Dionne via llvm-commits]

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+#!/bin/bash
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ldionne wrote:

> It doesn't support formatting code outside of github actions.

What's the issue? It should be possible to change it so that we can use it locally too?

https://github.com/llvm/llvm-project/pull/73798