Nikita Popov 2d2ef384b2 [libunwind] Only include cet.h if __CET__ defined
We should not assume that the cet.h header exists just because
we're on x86 linux. Only include it if __CET__ is defined. This
makes the code more similar to what compiler-rt does in
ee423d93ea/compiler-rt/lib/builtins/assembly.h (L17)
(though that one also has a __has_include() check -- I've not found
that to be necessary).

Differential Revision: https://reviews.llvm.org/D119697
2022-02-16 09:45:54 +01:00
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