Revert "[clang][X86] Add __cpuidex function to cpuid.h"
This reverts commit
2df77ac20a1ed996706b164b0c4ed5ad140f635f.
This has been causing some issues with some windows builds as
_MSC_EXTENSIONS isn't defined when only -fms-extensions is set, but the
builtin that conflicts with __cpuidex is. This was also causing problems
as it exposed some latent issues with how auxiliary triples are handled
in clang.
Differential Revision: https://reviews.llvm.org/D157115
(cherry picked from commit
f3baf63d9a1ba91974f4df6abb8f2abd9a0df5b5)