Represent RegUnit liveness with LiveRange instance

Previously LiveInterval has been used, but having a spill weight and
register number is unnecessary for a register unit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192397 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index d5990ef..09b0ced 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -262,9 +262,9 @@
       else if (MOI->isDef()) {
         for (MCRegUnitIterator Units(Reg, MRI.getTargetRegisterInfo());
              Units.isValid(); ++Units) {
-          if (LiveInterval *LI = LIS.getCachedRegUnit(*Units)) {
-            if (VNInfo *VNI = LI->getVNInfoAt(Idx))
-              LI->removeValNo(VNI);
+          if (LiveRange *LR = LIS.getCachedRegUnit(*Units)) {
+            if (VNInfo *VNI = LR->getVNInfoAt(Idx))
+              LR->removeValNo(VNI);
           }
         }
       }