Fully qualify llvm::next to avoid ambiguity when building as C++11.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175608 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 68f4b16..74793be 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -440,7 +440,7 @@
 
     iterator OutIt = begin();
     OutIt->valno = NewVNInfo[LHSValNoAssignments[OutIt->valno->id]];
-    for (iterator I = next(OutIt), E = end(); I != E; ++I) {
+    for (iterator I = llvm::next(OutIt), E = end(); I != E; ++I) {
       VNInfo* nextValNo = NewVNInfo[LHSValNoAssignments[I->valno->id]];
       assert(nextValNo != 0 && "Huh?");