[workflows] Set up GitHub actions for Classic Flang

This commit squashes the following CI-related patches from the release_14x
branch.

  commit 54a96d0
  Author: Kiran Chandramohan <kiran.chandramohan@arm.com
  Date:   Wed Oct 28 17:08:22 2020 +0000

      [workflows] Removing a few CI pipelines

  commit 8bf9551
  Author: Bryan Chan <bryan.chan@huawei.com>
  Date:   Mon May 2 21:16:56 2022 -0400

      [workflows] Stop using upstream actions and enable OpenMP build

  commit b921dd2
  Author: michalpasztamobica <michal.paszta@mobica.com>
  Date:   Fri Jun 4 13:55:52 2021 +0200

      [workflows] Allow pre-compile jobs to be trigerred manually.

  commit 9f828fd
  Author: michalpasztamobica <michal.paszta@mobica.com>
  Date:   Fri Jun 4 22:09:44 2021 +0200

      [workflows] Add build scripts and make CI use them.

  commit a976b96
  Author: Abraham Tovar <abraham.tovar@mobica.com>
  Date:   Wed Oct 13 11:40:30 2021 +0200

      [workflows] LLVM release_13x CI changes

  commit 7a5ee22
  Author: Abraham Tovar <abraham.tovar@mobica.com>
  Date:   Wed Nov 17 10:14:21 2021 +0000

      [workflows] Removing CI test-base for release_100

  commit a39a0c6
  Author: pwisniewskimobica <przemyslaw.wisniewski@mobica.com>
  Date:   Thu Jan 27 15:06:19 2022 +0100

      [workflows] Use GCC 11 in CI builds

  commit 198a6b2
  Author: pwisniewskimobica <przemyslaw.wisniewski@mobica.com>
  Date:   Thu Jan 13 10:11:43 2022 +0100

      [workflows] Modify CI scripts to add more test variants

  commit 84ed34d
  Author: Bryan Chan <bryan.chan@huawei.com>
  Date:   Sun Apr 24 19:13:25 2022 -0400

      [workflows] support GitHub actions for release_14x branch

  commit dd852a6
  Author: Bryan Chan <bryanpkc@gmail.com>
  Date:   Fri Jul 15 21:50:21 2022 -0400

      [workflows] Fix CI for release_14x

  commit b52bcc0
  Author: Bryan Chan <bryanpkc@gmail.com>
  Date:   Wed Jul 27 22:28:43 2022 -0400

      [build] Stop caching AArch64 Docker image layers

Author: kiranchandramohan

.github/workflows/flang-tests.yml

@@ -0,0 +1,80 @@
+name: Build and test Flang
+
+on:
+  pull_request:
+    branches: [ release_11x, release_12x, release_13x, release_14x ]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    env:
+      install_prefix: /usr/local
+    strategy:
+      matrix:
+        target: [X86]
+        cc: [clang]
+        cpp: [clang++]
+        version: [10, 11]
+        include:
+          - target: X86
+            cc: gcc
+            cpp: g++
+            version: 10
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - if: matrix.cc == 'clang'
+        run: |
+          sudo add-apt-repository ppa:ubuntu-toolchain-r/ppa
+          sudo touch /etc/apt/sources.list.d/llvm.list
+          echo 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main' | sudo tee -a /etc/apt/sources.list.d/llvm.list
+          echo 'deb-src http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main'  | sudo tee -a /etc/apt/sources.list.d/llvm.list
+          wget -q -O - http://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
+          sudo apt update
+          sudo apt install -f -y llvm-${{ matrix.version }} clang-${{ matrix.version}}
+
+      - if: matrix.cc == 'gcc' && matrix.version == '10'
+        run: |
+          sudo add-apt-repository ppa:ubuntu-toolchain-r/ppa
+          sudo apt install gcc-10 g++-10
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 10
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 20
+          sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 10
+          sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-10 20
+
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1
+        with:
+          key: key-${{ matrix.cc }}-${{ matrix.version }}
+
+      - name: Check tools
+        run: |
+          git --version
+          cmake --version
+          make --version
+          ${{ matrix.cc }}-${{ matrix.version }} --version
+          ${{ matrix.cpp }}-${{ matrix.version }} --version
+
+      - name: Build and install llvm
+        run: ./build-llvm-project.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -a /usr/bin/${{ matrix.cc }}-${{ matrix.version }} -b /usr/bin/${{ matrix.cpp }}-${{ matrix.version }} -n $(nproc) -c -i -s -v
+
+      - name: Checkout flang
+        run: |
+          cd ../..
+          git clone --depth 1 --single-branch --branch master https://github.com/flang-compiler/flang.git
+
+      - name: Build and install libpgmath & flang
+        run: |
+          cd ../../flang
+          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n $(nproc) -c -s
+
+      - name: Copy llvm-lit
+        run: |
+          cd ../../flang
+          cp ../classic-flang-llvm-project/classic-flang-llvm-project/build/bin/llvm-lit build/bin/.
+
+      - name: Test flang
+        run: |
+          cd ../../flang/build
+          make check-all

.github/workflows/libclang-abi-tests.yml

@@ -63,14 +63,17 @@ jobs:
   lit-tests:
     name: Lit Tests
     runs-on: ${{ matrix.os }}
-    container:
-      image: ${{(startsWith(matrix.os, 'ubuntu') && 'ghcr.io/llvm/ci-ubuntu-22.04:latest') || null}}
-      volumes:
-        - /mnt/:/mnt/
+    env:
+      install_prefix: /usr/local
     strategy:
       fail-fast: false
       matrix:
-        os: ${{ fromJSON(inputs.os_list) }}
+        target: [X86]
+        os:
+          - ubuntu-latest
+          # We're using a specific version of macOS due to:
+          # https://github.com/actions/virtual-environments/issues/5900
+          - macOS-11
     steps:
       - name: Setup Windows
         if: startsWith(matrix.os, 'windows')
@@ -108,47 +111,19 @@ jobs:
           max-size: 2G
           key: ${{ matrix.os }}
           variant: sccache
-      - name: Build and Test
+      - name: Test clang macOS
+        if: ${{ matrix.os == 'macOS-11'}}
         env:
           # Workaround for https://github.com/actions/virtual-environments/issues/5900.
           # This should be a no-op for non-mac OSes
           PKG_CONFIG_PATH: /usr/local/Homebrew/Library/Homebrew/os/mac/pkgconfig//12
-        shell: bash
-        id: build-llvm
         run: |
-          if [ "${{ runner.os }}" == "Linux" ]; then
-            builddir="/mnt/build/"
-            sudo mkdir -p $builddir
-            sudo chown gha $builddir
-            extra_cmake_args="-DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER=clang"
-          else
-            builddir="$(pwd)"/build
-          fi
-          if [ "${{ runner.os }}" == "macOS" ]; then
-            # Workaround test failure on some lld tests on MacOS
-            # https://github.com/llvm/llvm-project/issues/81967
-            extra_cmake_args="-DLLVM_DISABLE_ASSEMBLY_FILES=ON"
-          fi
-          echo "llvm-builddir=$builddir" >> "$GITHUB_OUTPUT"
-          cmake -G Ninja \
-                -B "$builddir" \
-                -S llvm \
-                -DLLVM_ENABLE_PROJECTS="${{ inputs.projects }}" \
-                -DCMAKE_BUILD_TYPE=Release \
-                -DLLVM_ENABLE_ASSERTIONS=ON \
-                -DLLDB_INCLUDE_TESTS=OFF \
-                -DLIBCLC_TARGETS_TO_BUILD="amdgcn--;amdgcn--amdhsa;r600--;nvptx--;nvptx64--;nvptx--nvidiacl;nvptx64--nvidiacl" \
-                -DCMAKE_C_COMPILER_LAUNCHER=sccache \
-                -DCMAKE_CXX_COMPILER_LAUNCHER=sccache \
-                $extra_cmake_args \
-                ${{ inputs.extra_cmake_args }}
-          ninja -C "$builddir" '${{ inputs.build_target }}'
-
-      - name: Build and Test libclc
-        if: "!startsWith(matrix.os, 'windows') && contains(inputs.projects, 'libclc')"
-        env:
-          LLVM_BUILDDIR: ${{ steps.build-llvm.outputs.llvm-builddir }}
+          ./build-llvm-project.sh -t X86 -e "clang" -p /usr/local -s -n $(sysctl -n hw.logicalcpu) -i -v
+          cd build
+          make check-all
+      - name: Test clang ubuntu
+        if: ${{ matrix.os == 'ubuntu-latest'}}
         run: |
-          # The libclc tests don't have a generated check target so all we can
-          # do is build it.
-          ninja -C "$LLVM_BUILDDIR"
+          ./build-llvm-project.sh -t X86 -e "${{ inputs.projects }}" -p /usr/local -s -n $(nproc) -i -v
+          cd build
+          make check-all