Refactor JumpTarget::Combine.

src/jump-target.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 184 matching lines @@
   // return values using the virtual frame.
   void DoJump();
   void DoBranch(Condition cc, Hint hint);
   void DoBind(int mergable_elements);
 
  private:
   // Add a virtual frame reaching this labeled block via a forward
   // jump, and a fresh label for its merge code.
   void AddReachingFrame(VirtualFrame* frame);
 
-  // Choose an element from a pair of frame elements to be in the
-  // expected frame.  Return null if they are incompatible.
-  FrameElement* Combine(FrameElement* left, FrameElement* right);
-
   // 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);
 };
 
 
 // -------------------------------------------------------------------------
 // Break targets
@@ skipping 97 matching lines @@
   bool is_shadowing_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ShadowTarget);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JUMP_TARGET_H_