[cfe-commits] [Patch] Fix Include Search for stdin (PR 4897)

[Jon Simons]

Attached is a patch which fixes #include search when processing
stdin.  It also contains a test case.  This is for PR 4897.

There is no FileEntry maintained for stdin, so I changed the
HeaderSearch::LookupFile to instead use an llvm::sys:Path.
While there I took care of a FIXME.  I am willing to refactor
this per suggestions if needed.


Thanks,
-Jon Simons
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