improve portability to avoid conflicting with std::next in c++'0x.
Patch by Howard Hinnant!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90365 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index d82d928..d711d81 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -454,8 +454,8 @@
       }
 
       // If the block has any instructions after a JMP, delete them.
-      while (next(I) != MBB.end())
-        next(I)->eraseFromParent();
+      while (llvm::next(I) != MBB.end())
+        llvm::next(I)->eraseFromParent();
       Cond.clear();
       FBB = 0;