Remove uses of getSubtargetImpl from ResourcePriorityQueue and
replace them with calls off of the MachineFuncton.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219381 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused argument to CreateTargetScheduleState and change
the TargetMachine to a TargetSubtargetInfo since everything
we wanted is off of that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219382 91177308-0d34-0410-b5e6-96231b3b80d8