[PATCH] InstrProf: Add initial compiler-rt test

[Duncan P. N. Exon Smith]

This patch adds the infrastructure for compiler-rt tests for instrumented profiling.
It also adds a single very simple test.

I’m a little lost with lit and cmake; could someone who knows better have a look to
make sure I have the right magic?

I copied and modified the logic from the test/asan/ directory.

There are two things that don’t (or probably don’t) work.

 1. You cannot call:

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

    The other compiler-rt tests seem to have the same defect, and I’m not sure how
    to fix it.

    Nevertheless, using cmake+ninja, you can call:

        $ ninja check-profile

 2. I didn’t do anything with configure+make, since the other tests in compiler-rt
    didn’t have a model I could copy.  So the tests probably aren’t registered
    there.

Thanks for any pointers!

Duncan

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