[cfe-commits] patch: libcxxabi __cxa_guard_* for ARM EABI

[Nick Lewycky]

The attached patch implements the ARM EABI versions of
__cxa_guard_{acquire,release,abort} while trying to share as much code as
possible. It appears to me that it's unlikely that this will build correctly
on __APPLE__ machines, but that's beyond my ability to deal with here. I
have also not actually tested this on an ARM machine, but I did #define
LIBCXXABI_ARMEABI and build the tests and those pass on x86-64.

Once again, please review!

Nick
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