Eliminate most of the jump target jumping, branching, and binding...

src/arm/virtual-frame-arm.h

 // Copyright 2009 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 94 matching lines @@
   // frame (eg, the frame after an exception handler is pushed).  No code is
   // emitted.
   void Adjust(int count);
 
   // Forget elements from the top of the frame to match an actual frame (eg,
   // the frame after a runtime call).  No code is emitted.
   void Forget(int count) {
     ASSERT(count >= 0);
     ASSERT(stack_pointer_ == element_count() - 1);
     stack_pointer_ -= count;
-    ForgetElements(count);
+    // On ARM, all elements are in memory, so there is no extra bookkeeping
+    // (registers, copies, etc.) beyond dropping the elements.
+    elements_.Rewind(stack_pointer_ + 1);
   }
 
-  // Forget count elements from the top of the frame without adjusting
-  // the stack pointer downward.  This is used, for example, before
-  // merging frames at break, continue, and return targets.
+  // Forget count elements from the top of the frame and adjust the stack
+  // pointer downward.  This is used, for example, before merging frames at
+  // break, continue, and return targets.
   void ForgetElements(int count);
 
   // Spill all values from the frame to memory.
   void SpillAll();
 
   // Spill all occurrences of a specific register from the frame.
   void Spill(Register reg) {
     if (is_used(reg)) SpillElementAt(register_location(reg));
   }
 
@@ skipping 383 matching lines @@
 
   // Classes that need raw access to the elements_ array.
   friend class DeferredCode;
   friend class JumpTarget;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_VIRTUAL_FRAME_ARM_H_