[PATCH] [X86] Use sys::getHostCPUFeatures to improve -march=native

[Craig Topper]

The target-cpu is still used for LLVM "features" that don't have a real CPUID bit. For instance, slow-bt-mem and slow-incdec. It would also still be used to pick the scheduling model.


http://reviews.llvm.org/D8694

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