update a couple of references to SSARegMap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45468 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/ScheduleDAG.cpp

@@ -606,7 +606,7 @@ void ScheduleDAG::EmitSubregNode(SDNode *Node,
       SubIdx = cast<ConstantSDNode>(Node->getOperand(2))->getValue();
     }
     
-    // TODO: Add tracking info to SSARegMap of which vregs are subregs
+    // TODO: Add tracking info to MachineRegisterInfo of which vregs are subregs
     // to allow coalescing in the allocator
           
     // If the node is only used by a CopyToReg and the dest reg is a vreg, use

lib/CodeGen/SimpleRegisterCoalescing.cpp

@@ -1410,8 +1410,8 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
       (*I)->eraseFromParent();
     }
 
-    // Transfer sub-registers info to SSARegMap now that coalescing information
-    // is complete.
+    // Transfer sub-registers info to MachineRegisterInfo now that coalescing
+    // information is complete.
     RegSubIdxMap.grow(RegInfo.getLastVirtReg()+1);
     while (!SubRegIdxes.empty()) {
       std::pair<unsigned, unsigned> RI = SubRegIdxes.back();