[PATCH] [UBSan] Use shared library for UBSan on OS X (compiler-rt part).

[Alexey Samsonov]

Thanks for testing this!

I've submitted this change in r233036. Let's see if it would work and not break the bots. Switching to libc++ everywhere (including in ASan) is a different thing, and we can proceed with it once we know how to test/verify it.


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http://reviews.llvm.org/D8473

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