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Allow running back-deployment testing against libc++abi

Authored by ldionne on Jul 8 2020, 1:38 PM.

Description

Allow running back-deployment testing against libc++abi

Summary:
Before this patch, we could only link against the back-deployment libc++abi
dylib. This patch allows linking against the just-built libc++abi, but
running against the back-deployment one -- just like we do for libc++.

Also, add XFAIL markup to flag expected errors.