[X86] Vector extract instructions marked as Ld and WriteRMW

[topperc]

Bugzilla Link	36887
Resolution	FIXED
Resolved on	Apr 24, 2018 10:11
Version	trunk
OS	All
Blocks	#31672
CC	@RKSimon
Fixed by commit(s)	330714,330737

Extended Description

For example

PEXTRBmr has WriteShuffleLd WriteRMW

But the instruction doesn't load anything.

Affected instructions

EXTRACTPSmr
PEXTRBmr
PEXTRDmr
PEXTRQmr
PEXTRWmr
VCVTPS2PHYmr
VCVTPS2PHmr
VEXTRACTPSmr
VPEXTRBZmr
VPEXTRBmr
VPEXTRDZmr
VPEXTRDmr
VPEXTRQZmr
VPEXTRQmr
VPEXTRWZmr
VPEXTRWmr

[topperc]

assigned to @RKSimon

[RKSimon]

https://reviews.llvm.org/D45929 fixes all the extractions

[RKSimon]

Extractions were fixed at rL330714

VCVTPS2PHS cases were fixed at rL330737