[X86] Remove the VMFUNC feature flag. It was only partially implemented and we have no support for codegening vmfunc instructions today.

If that support ever gets added, the full feature flag support should come along with it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294406 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed