Fix comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35139 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/RegisterScavenging.h

@@ -71,7 +71,7 @@ public:
   void backward();
 
   /// forward / backward - Move the internal MBB iterator and update register
-  /// states until it has reached but not processed the specific iterator.
+  /// states until it has processed the specific iterator.
   void forward(MachineBasicBlock::iterator I) {
     while (MBBI != I) forward();
   }