Petr Hosek c4819eec1a [CMake][libc] Don't do CPU feature detection when cross-compiling
We won't be able to run the compiled program since it will be compiled
for different system. We instead allow passing the CPU features via
CMake option in that case.

Differential Revision: https://reviews.llvm.org/D95203
2021-01-28 12:54:37 -08:00
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