Reverse iterator - should be incrementing rather than decrementing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150778 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 52a9096..3ab98e1 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -904,9 +904,9 @@
   if (!isInsideBundle())
     return this;
   MachineBasicBlock::reverse_instr_iterator MII(this);
-  --MII;
+  ++MII;
   while (MII->isInsideBundle())
-    --MII;
+    ++MII;
   return &*MII;
 }