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

[via llvm-commits]

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@@ -9,16 +9,24 @@ permissions:
 
 jobs:
   check_generated_files:
-    runs-on: ubuntu-latest
+    runs-on:
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EricWF wrote:

Yeah, I was trying to hijack it to test the added hooks, but it's trickier that I would have liked.


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