Reapply revision 1949. Stupid error....

src/jump-target.h

Index: src/jump-target.h
===================================================================
--- src/jump-target.h	(revision 1950)
+++ src/jump-target.h	(working copy)
@@ -35,7 +35,6 @@
 class Result;
 class VirtualFrame;
 
-
 // -------------------------------------------------------------------------
 // Jump targets
 //
@@ -68,6 +67,8 @@
   // AST nodes.
   JumpTarget();
 
+  virtual ~JumpTarget() {}
+
   // Supply a code generator and directionality to an already
   // constructed jump target.  This function expects to be given a
   // non-null code generator, and to be called only when the code
@@ -199,8 +200,13 @@
   // 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);
@@ -225,6 +231,8 @@
   // nodes.
   BreakTarget() {}
 
+  virtual ~BreakTarget() {}
+
   // Supply a code generator, expected expression stack height, and
   // directionality to an already constructed break target.  This
   // function expects to be given a non-null code generator, and to be
@@ -287,6 +295,8 @@
   // flow intended for the shadowed one.
   explicit ShadowTarget(BreakTarget* shadowed);
 
+  virtual ~ShadowTarget() {}
+
   // End shadowing.  After shadowing ends, the original jump target
   // again gives access to the formerly shadowed target and the shadow
   // target object gives access to the formerly shadowing target.