Reduce the memory used by frame elements from two words to one by...

src/jump-target.h

Index: src/jump-target.h
===================================================================
--- src/jump-target.h	(revision 1947)
+++ src/jump-target.h	(working copy)
@@ -35,7 +35,6 @@
 class Result;
 class VirtualFrame;
 
-
 // -------------------------------------------------------------------------
 // Jump targets
 //
@@ -199,8 +198,13 @@
   // and a corresponding merge code label.
   void AddReachingFrame(VirtualFrame* frame);
 
-  // Compute a frame to use for entry to this block.  Mergable elements
-  // is as described for the Bind function.
+  // Perform initialization required during entry frame computation
+  // after setting the virtual frame element at index in frame to be
+  // target.
+  inline void InitializeEntryElement(int index, FrameElement* target);
+
+  // Compute a frame to use for entry to this block.  Mergable
+  // elements is as described for the Bind function.
   void ComputeEntryFrame(int mergable_elements);
 
   DISALLOW_COPY_AND_ASSIGN(JumpTarget);