[clang] Add builtin to clear padding bytes (prework for P0528R3) #4564

	name: "Check libc++ generated files"
	on:
	pull_request:
	paths:
	- 'libcxx/**'

	permissions:
	contents: read

	jobs:
	check_generated_files:
	runs-on: ubuntu-latest
	steps:
	- name: Fetch LLVM sources
	uses: actions/checkout@v4

	- name: Install dependencies
	uses: aminya/setup-cpp@v1
	with:
	clangformat: 17.0.1
	ninja: true

	- name: Check generated files
	run: libcxx/utils/ci/run-buildbot check-generated-output

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