[CI][Github] Add linux premerge workflow #7

	name: LLVM Premerge Checks

	permissions:
	contents: read

	on:
	pull_request:
	paths:
	- .github/workflows/premerge.yaml

	jobs:
	premerge-checks-linux:
	if: github.repository_owner == 'llvm'
	runs-on: ubuntu-latest
	steps:
	- name: Checkout LLVM
	uses: actions/checkout@v4
	with:
	fetch-depth: 2
	- name: Build and Test
	run: \|
	modified_files=$(git diff --name-only HEAD~1...HEAD)
	modified_dirs=$(echo "$modified_files" \| cut -d'/' -f1 \| sort -u)

	. ./.ci/compute-projects.sh

	all_projects="bolt clang clang-tools-extra compiler-rt cross-project-tests flang libc libclc lld lldb llvm mlir openmp polly pstl"
	modified_projects="$(keep-modified-projects ${all_projects})"

	linux_projects_to_test=$(exclude-linux $(compute-projects-to-test 0 ${modified_projects}))
	linux_check_targets=$(check-targets ${linux_projects_to_test} \| sort \| uniq)
	linux_projects=$(add-dependencies ${linux_projects_to_test} \| sort \| uniq)

	linux_runtimes_to_test=$(compute-runtimes-to-test ${linux_projects_to_test})
	linux_runtime_check_targets=$(check-targets ${linux_runtimes_to_test} \| sort \| uniq)
	linux_runtimes=$(echo ${linux_runtimes_to_test} \| sort \| uniq)

	echo "Building projects: ${linux_projects}"
	echo "Running project checks targets: ${linux_check_targets}"
	echo "Building runtimes: ${linux_runtimes}"
	echo "Running runtimes checks targets: ${linux_runtime_check_targets}"

	./.ci/monolithic-linux.sh "$(echo ${linux_projects} \| tr ' ' ';')" "$(echo ${linux_check_targets})" "$(echo ${linux_runtimes} \| tr ' ' ';')" "$(echo ${linux_runtime_check_targets})"

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