[PATCH] D21991: [libunwind][ARM] Improve unwinder stack usage - Make WMMX support optional

[Asiri Rathnayake via cfe-commits]

rmaprath added a reviewer: compnerd.
rmaprath removed a subscriber: compnerd.
rmaprath updated this revision to Diff 62890.
rmaprath added a comment.

- Use `__ARM_WMMX` instead of `_LIBUNWIND_ARM_WMMX`
- Add a comment to the cmake option `LIBUNWIND_ENABLE_ARM_WMMX` to explain why it is done this way


http://reviews.llvm.org/D21991

Files:
  CMakeLists.txt
  include/__libunwind_config.h
  src/Registers.hpp
  src/Unwind-EHABI.cpp
  src/UnwindRegistersRestore.S
  src/UnwindRegistersSave.S

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