[PATCH] Fix GetRepositoryPath and GetSourceVersion to work with Git, submodules

[Vincent Danjean]

  Hi,

  Here is a patch that fix repository path and source version detections
when llvm (or clang, ...) are used as submodules into another project.
Indeed, in this case, .git is a file, not a directory.

  The patch is really simple. If you want to fix the submodule use case
differently, please do so. If you want to discuss with me of this
problem, please CC me as I'm not subscribed (in any case, I will look
at the list archive during a few days)

  Regards,
   Vincent
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