Update llvm-project to llvm/llvm-project@af20aff35ec3 #12227

	# This is a basic workflow to help you get started with Actions

	name: GitHub Action Clang Format

	# Controls when the action will run. Triggers the workflow on push or pull request
	on: [push, pull_request]

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "check"
	check:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v2
	- name: clang-format lint
	uses: DoozyX/clang-format-lint-action@v0.5
	with:
	# Source folder to check formatting
	source: ./src
	# Version of clang-format
	clangFormatVersion: 9 # optional, default is 9

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