[PATCH] [test-suite] Add test for basic correctness of frame lowering

[Kristof Beyls]

================
Comment at: MultiSource/Makefile:5
@@ -4,3 +4,1 @@
 PARALLEL_DIRS  := Applications Benchmarks
-# For now only Mips uses UnitTests
-ifeq ($(ARCH),Mips)
----------------
rengolin wrote:
> This is a bit too generic. I'd add AArch64, maybe ARM, but not enable for everything before making sure all UnitTests work on all platforms we run the test-suite.
The only unit test that this will enable to run extra is the frame_layout unit test that is being added by this patch.
All the other pre-existing unit tests have been moved to a "Mips" directory inside the UnitTests sub-directory.
This way, MultiSource/UnitTests becomes available for non-Mips-specific tests too.

My plan is to commit this patch as is. I expect to potentially see some bots fail on architectures that have e.g. not
fully implemented dynamic stack realignment yet. I'll add skips for those architectures further down in the directory structure,
to just skip the new frame_layout test case. I plan to do the commit of this test in the morning European time, when the commit rate is lower,
to not disrupt others too much if it turns out some architectures do not pass the new frame_layout test.

http://reviews.llvm.org/D8922

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