Shave 39% from snapshot size.

src/x64/macro-assembler-x64.cc

 // Copyright 2011 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 37 matching lines @@
       root_array_available_(true) {
   if (isolate() != NULL) {
     code_object_ = Handle<Object>(isolate()->heap()->undefined_value(),
                                   isolate());
   }
 }
 
 
 static intptr_t RootRegisterDelta(ExternalReference other, Isolate* isolate) {
   Address roots_register_value = kRootRegisterBias +
-      reinterpret_cast<Address>(isolate->heap()->roots_address());
+      reinterpret_cast<Address>(isolate->heap()->roots_array_start());
   intptr_t delta = other.address() - roots_register_value;
   return delta;
 }
 
 
 Operand MacroAssembler::ExternalOperand(ExternalReference target,
                                         Register scratch) {
   if (root_array_available_ && !Serializer::enabled()) {
     intptr_t delta = RootRegisterDelta(target, isolate());
     if (is_int32(delta)) {
@@ skipping 4258 matching lines @@
 
   and_(bitmap_scratch, Immediate(~Page::kPageAlignmentMask));
   addl(Operand(bitmap_scratch, MemoryChunk::kLiveBytesOffset), length);
 
   bind(&done);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64