Sean Callanan 558e52c108 [build-script] Bring in modernizations from downstream: ...

- Don't do any checks of the current SCM repository if the
  llvm repositories are already there.  Useful for bots.
- When symlinking, remove old symlinks.
- Support loading build-script as a library, not necessarily
  under Xcode.
- Stringify args before passing them to subprocess.

llvm-svn: 309631

2017-07-31 21:50:00 +00:00

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