Rename LiveRange to LiveInterval::Segment

The Segment struct contains a single interval; multiple instances of this struct
are used to construct a live range, but the struct is not a live range by
itself.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192392 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveDebugVariables.cpp b/lib/CodeGen/LiveDebugVariables.cpp
index 4b8395b..c1f6fd5 100644
--- a/lib/CodeGen/LiveDebugVariables.cpp
+++ b/lib/CodeGen/LiveDebugVariables.cpp
@@ -510,14 +510,14 @@
     // Limit to VNI's live range.
     bool ToEnd = true;
     if (LI && VNI) {
-      LiveRange *Range = LI->getLiveRangeContaining(Start);
-      if (!Range || Range->valno != VNI) {
+      LiveInterval::Segment *Segment = LI->getSegmentContaining(Start);
+      if (!Segment || Segment->valno != VNI) {
         if (Kills)
           Kills->push_back(Start);
         continue;
       }
-      if (Range->end < Stop)
-        Stop = Range->end, ToEnd = false;
+      if (Segment->end < Stop)
+        Stop = Segment->end, ToEnd = false;
     }
 
     // There could already be a short def at Start.