John Baldwin 1e18e7d203 Add support for MIPS to LLVM's libunwind.
This is originally based on a patch from David Chisnall for soft-float
N64 but has since been updated to support O32, N32, and hard-float ABIs.
The soft-float O32, N32, and N64 support has been committed upstream.
The hard-float changes are still in review upstream.

Enable LLVM_LIBUNWIND on mips when building with a suitable (C+11-capable)
toolchain.  This has been tested with external GCC for all ABIs and
O32 and N64 with clang.

Reviewed by:	emaste
Obtained from:	CheriBSD (original N64 patch)
Sponsored by:	DARPA / AFRL
Differential Revision:	https://reviews.freebsd.org/D14701
2018-03-20 15:44:17 +00:00
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