Unify markbits for old and new spaces.

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 825 matching lines @@
     Isolate* isolate) {
   return ExternalReference(isolate->regexp_stack()->limit_address());
 }
 
 
 ExternalReference ExternalReference::new_space_start(Isolate* isolate) {
   return ExternalReference(isolate->heap()->NewSpaceStart());
 }
 
 
-ExternalReference ExternalReference::new_space_mark_bits(Isolate* isolate) {
-  return ExternalReference(isolate->heap()->marking()->new_space_bitmap());
-}
-
-
 ExternalReference ExternalReference::store_buffer_top(Isolate* isolate) {
   return ExternalReference(isolate->heap()->store_buffer()->TopAddress());
 }
 
 
 ExternalReference ExternalReference::new_space_mask(Isolate* isolate) {
   return ExternalReference(reinterpret_cast<Address>(
       isolate->heap()->NewSpaceMask()));
 }
 
@@ skipping 339 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal