GitLab

The LLVM project moved from SVN to git, and lld's version information
does not include SVN revisions anymore. This CL makes the version
parsing in download_lld_mac.py permissive enought to accept git commit
hashes.

Bug: 897796
Change-Id: I0d11703f6982172dd64e7d7c9a64dcaa2fe6757f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630811
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663718}