message: Use LLVM 8.0 release in alloy.py
diff: @@ -139,7 +139,7 @@ def checkout_LLVM(component, use_git, version_LLVM, revision, target_dir, from_v
  SVN_PATH="trunk"
  GIT_BRANCH="master"
  elif version_LLVM == "8_0":
  - SVN_PATH="branches/release_80"
  + SVN_PATH="tags/RELEASE_800/final"
  GIT_BRANCH="release_80"
  elif version_LLVM == "7_0":
  SVN_PATH="tags/RELEASE_701/final"
  