llvm dev - Feb 2017 - Teaching lit to expand glob expressions

Hi all, in https://reviews.llvm.org/D30380 I've uploaded a patch that
allows lit RUN lines to expand expressions that will be globbed against the
file system.

It already has an LGTM, but given that lit is so fundamental and this adds
core functionality, I thought I'd post it here in case anyone else has any
thoughts.  I plan to submit this tomorrow if there are no objections or
concerns.
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