Use getInterval() instead of getOrCreateInterval().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175731 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index 61122fc..b84d9d3 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -319,7 +319,7 @@
                                     IncomingVNI));
     }
 
-    LiveInterval &DestLI = LIS->getOrCreateInterval(DestReg);
+    LiveInterval &DestLI = LIS->getInterval(DestReg);
     if (NewInstr->getOperand(0).isDead()) {
       // A dead PHI's live range begins and ends at the start of the MBB, but
       // the lowered copy, which will still be dead, needs to begin and end at