[PATCH] Teach llvm-lit about ENABLE_BACKTRACES

[Pete Cooper]

Hi Chandler, Owen

In your patches to LLVM which changed ThreadLocal and PrettyStackTrace, we ended up requiring ENABLE_BACKTRACES for PrettyStackTrace.

Trouble is, clang has 2 tests which check for the pretty stack trace on crashes.  This patch teaches lit about the ENABLE_BACKTRACES option, and updates those 2 tests to use that option.  Without this patch, clang fails to pass llvm-lit without back traces.

Thanks,
Pete

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