Remove the unused, inaptly-named, and incorrect RequiresMergeCode.

src/virtual-frame-ia32.cc

 // 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 255 matching lines @@
   // The arguments are spilled.
   for (int i = arg_base_index; i < elements_.length(); i++) {
     SpillElementAt(i);
   }
 
   // Forget the frame elements that will be popped by the call.
   Forget(frame_arg_count);
 }
 
 
-bool VirtualFrame::RequiresMergeCode() {
-  // A frame requires code to be generated to make the frame mergable if
-  // there are duplicated non-synched registers or else valid elements not
-  // in a (memory or register) location in the frame.  We look for valid
-  // non-synced non-location elements and count occurrences of non-synced
-  // registers.
-  RegisterFile non_synced_regs;
-  for (int i = 0; i < elements_.length(); i++) {
-    FrameElement element = elements_[i];
-    if (element.is_valid() && !element.is_synced()) {
-      if (element.is_register()) {
-        non_synced_regs.Use(elements_[i].reg());
-      } else if (!element.is_memory()) {
-        // Not memory or register and not synced.
-        return true;
-      }
-    }
-  }
-
-  for (int i = 0; i < RegisterFile::kNumRegisters; i++) {
-    if (non_synced_regs.count(i) > 1) {
-      return true;
-    }
-  }
-
-  return false;
-}
-
-
 void VirtualFrame::MakeMergable() {
   Comment cmnt(masm_, "[ Make frame mergable");
   // We should always be merging the code generator's current frame to an
   // expected frame.
   ASSERT(cgen_->frame() == this);
   ASSERT(cgen_->HasValidEntryRegisters());
 
   // Remove constants from the frame and ensure that no registers are
   // multiply referenced within the frame.  Allocate elements to their new
   // locations from the top down so that the topmost elements have a chance
@@ skipping 742 matching lines @@
       return false;
     }
   }
   return true;
 }
 #endif
 
 #undef __
 
 } }  // namespace v8::internal