[X86] Add WriteFMOVMSK/WriteVecMOVMSK/WriteMMXMOVMSK scheduler classes

Currently MOVMSK instructions use the WriteVecLogic class, which is a very poor choice given that MOVMSK involves a SSE->GPR transfer.

Differential Revision: https://reviews.llvm.org/D44924

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328664 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed