Louis Dionne f29002a4b7 [libunwind] Add a _LIBUNWIND_VERSION macro
This allows us to detect whether we're being compiled with LLVM's libunwind
more easily, without CMake having to set explicit variables.

As discussed in https://llvm.org/D119538.

Differential Revision: https://reviews.llvm.org/D121015
2022-03-30 11:23:36 -04:00
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