[X86] Atom scheduler model still uses old instruction itinerary classes

[RKSimon]

Bugzilla Link	32431
Resolution	FIXED
Resolved on	Apr 11, 2018 12:16
Version	trunk
OS	Windows NT
Blocks	#31672 #36441
CC	@topperc
Fixed by commit(s)	329834, 329837

Extended Description

llvm\lib\Target\X86\X86ScheduleAtom.td is still based on the old IIC_* style instruction classes, preventing us from removing the classes.

[RKSimon]

https://reviews.llvm.org/D45486

[RKSimon]

Fixed in rL329834/rL329837

[RKSimon]

mentioned in issue #36441