[TargetSchedule] shrink interface for init(); NFCI

The TargetSchedModel is always initialized using the TargetSubtargetInfo's 
MCSchedModel and TargetInstrInfo, so we don't need to extract those and 
pass 3 parameters to init().

Differential Revision: https://reviews.llvm.org/D44789

llvm-svn: 329540
diff --git a/llvm/lib/CodeGen/MachineLICM.cpp b/llvm/lib/CodeGen/MachineLICM.cpp
index f5b673d8..ce0a1b4 100644
--- a/llvm/lib/CodeGen/MachineLICM.cpp
+++ b/llvm/lib/CodeGen/MachineLICM.cpp
@@ -314,7 +314,7 @@
   TRI = ST.getRegisterInfo();
   MFI = &MF.getFrameInfo();
   MRI = &MF.getRegInfo();
-  SchedModel.init(ST.getSchedModel(), &ST, TII);
+  SchedModel.init(&ST);
 
   PreRegAlloc = MRI->isSSA();