[X86] Cleanup WriteFStore/WriteVecStore schedules

MOVNTPD/MOVNTPS should be WriteFStore

Standardized BDW/HSW/SKL/SKX WriteFStore/WriteVecStore - fixes some missed instregex patterns. (V)MASKMOVDQU was already using the default, its costs gets increased but is still nowhere near the real cost of that nasty instruction....

llvm-svn: 331864