[libcxxabi] Proposal to merge 6 recent libc++abi changes to release_36

[Logan Chien]

Hi,

I would like to propose to merge r226818, r226819, r226820, r226822,
r226823, and r226824 to the release_36 branch for libc++abi.

Here are the reasons for these changes:

1. Fixes the compilation of libc++abi for ARM without LLVM unwinder.
2. Fix the existing test case "backtrace_test" which was failing on ARM
(with and without LLVM unwinder)
3. Fixes the _Unwind_Backtrace() when libc++abi is built with CMake.

Is it OK to do so?  Thanks.

Thanks.

Logan


p.s. The complete list of changes:
r226818 - Remove _Unwind_{Get,Set}{GR,IP} from ARM EHABI build.
r226819 - Allow libc++abi to be built without unwinder.
r226820 - Fix _Unwind_Backtrace for libc++abi built with libgcc.
r226822 - Force unwind frame with user-defined personality.
r226823 - Add -funwind-tables to CMAKE_C_FLAGS.
r226824 - Enable backtrace_test for ARM.
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