Fix test stability (was sensitive to the path)

This is a fixup for r267304.
The test was sensitive to the path in a subtle way:
the index in memory is sorted by GUID, which are hashes
that include the source filename for local globals.
Teresa recently added a directive at the IR level, so
we can specify it here to make the test independent of
the path.

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 267305