message: Use Ubuntu 16.04 for LLVM 8.0 in travis
diff: @@ -37,6 +37,7 @@ language: minimal
  sudo: required
  services:
  - docker
  +dist: xenial
  # Some magic is here. Docker is used to load pre-built LLVM as part of custom built image.
  # Custom built LLVM is required because
  @@ -49,14 +50,14 @@ services:
  # (4) to have flexibility of testing with a range of LLVM versions that we need.
  env:
  global:
  - - DOCKER_REPO_PATH=ispc/ubuntu_14.04
  + - DOCKER_REPO_PATH=ispc/ubuntu_16.04
  - LLVM_HOME=/usr/local/src/llvm
  - ISPC_HOME=$TRAVIS_BUILD_DIR
  matrix:
  - - LLVM_VERSION=8.0 OS=Ubuntu14.04 DOCKER_TAG=llvm80
  - - LLVM_VERSION=7.0 OS=Ubuntu14.04 DOCKER_TAG=llvm70
  - - LLVM_VERSION=6.0 OS=Ubuntu14.04 DOCKER_TAG=llvm60
  - - LLVM_VERSION=5.0 OS=Ubuntu14.04 DOCKER_TAG=llvm50
  + - LLVM_VERSION=8.0 OS=Ubuntu16.04 DOCKER_TAG=llvm80
  + - LLVM_VERSION=7.0 OS=Ubuntu16.04 DOCKER_TAG=llvm70
  + - LLVM_VERSION=6.0 OS=Ubuntu16.04 DOCKER_TAG=llvm60
  + - LLVM_VERSION=5.0 OS=Ubuntu16.04 DOCKER_TAG=llvm50
  before_install:
  - sudo apt-get install -y libc6-dev-i386 g++-multilib lib32stdc++6
  