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unwind: Fix libc++abi and libgcc build.
To build libc++abi without libunwind, we should make sure that all function calls to _Unwind_{Get,Set}{GR,IP}() are inlined as function calls to _Unwind_VRS_{Get,Set}(). Otherwise, libc++abi.so will fail to link since libgcc does not provide these symbol at all. This commit fixes the problem by providing both the inlined version and exported version. git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@243073 91177308-0d34-0410-b5e6-96231b3b80d8
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