Missing intrinsics 4FMAPS and 4VNNIW not implemented

[llvmbot]

Bugzilla Link	37505
Version	6.0
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@topperc,@RKSimon

Extended Description

GCC 7 supports them. I tested 4FMAPS with GCC 7 and it is working.
It would be great to support these intrinsics as they are #​1 reason for KNM.