[PATCH] llvm-lit: Allow compiler-rt tests to run from the source tree

[Duncan P. N. Exon Smith]

This is a pair of patches that allow compiler-rt tests to be run
from the source tree.

The initial test for InstrProf (under review "[PATCH] InstrProf:
Add initial compiler-rt test" [1]) cannot be run from the source
tree.  For example, with cmake+ninja, a user must:

    $ path/to/build/bin/llvm-lit path/to/build/projects/compiler-rt/test/profile

or:

    $ cd path/to/build
    $ ninja check-profile

Both are inconvenient when maintaining tests.

With this pair of patches, users can also call, e.g.:

    $ cd path/to/src/projects/compiler-rt
    $ path/to/build/bin/llvm-lit test/profile

The other compiler-rt lit.cfg files can be easily updated to use
the same mechanism.

[1]: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140324/210812.html

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