message: Reduce time for LLVM build and pack by using gzip instead of xz
diff: @@ -40,20 +40,21 @@ jobs:
  docker run ispc/ubuntu16.04
  export CONTAINER=`docker ps --all |head -2 |tail -1 |awk '//{print $1}'`
  sudo docker cp $CONTAINER:/usr/local/src/llvm/bin-trunk .
  - tar cJvf llvm-trunk-ubuntu16.04-Release+Asserts-x86.arm.wasm.tar.xz bin-trunk
  + # Note using gzip here, instead of xz - trading of space for speed, as it's just for passing to another stage.
  + tar czvf llvm-trunk-ubuntu16.04-Release+Asserts-x86.arm.wasm.tar.gz bin-trunk
  - name: Upload package
  uses: actions/upload-artifact@v2
  with:
  name: llvm_trunk_linux
  - path: docker/ubuntu/llvm_build/llvm-trunk-ubuntu16.04-Release+Asserts-x86.arm.wasm.tar.xz
  + path: docker/ubuntu/llvm_build/llvm-trunk-ubuntu16.04-Release+Asserts-x86.arm.wasm.tar.gz
  linux-build-ispc-llvm-trunk:
  needs: [linux-build-llvm-trunk]
  runs-on: ubuntu-latest
  env:
  LLVM_VERSION: "trunk"
  - LLVM_TAR: llvm-trunk-ubuntu16.04-Release+Asserts-x86.arm.wasm.tar.xz
  + LLVM_TAR: llvm-trunk-ubuntu16.04-Release+Asserts-x86.arm.wasm.tar.gz
  steps:
  - uses: actions/checkout@v2
  