Return the new state from local analysis in flow-engine.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/27166003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17181 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-flow-engine.h

@@ -107,7 +107,7 @@ class HFlowEngine {
     for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
       state = state->Process(it.Current(), zone_);
     }
-    return StateAt(block);
+    return state;
   }
 
   // Global analysis. Iterates over all blocks that are dominated by the given