Make macro-assembler-x64 deal with handles to objects in new space by default.

src/x64/full-codegen-x64.cc

 // Copyright 2012 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 1111 matching lines @@
   __ jmp(&exit);
 
   // We got a fixed array in register rax. Iterate through that.
   Label non_proxy;
   __ bind(&fixed_array);
 
   Handle<Cell> cell = isolate()->factory()->NewCell(
       Handle<Object>(Smi::FromInt(TypeFeedbackCells::kForInFastCaseMarker),
                      isolate()));
   RecordTypeFeedbackCell(stmt->ForInFeedbackId(), cell);
-  __ LoadHeapObject(rbx, cell);
+  __ Move(rbx, cell);
   __ Move(FieldOperand(rbx, Cell::kValueOffset),
           Smi::FromInt(TypeFeedbackCells::kForInSlowCaseMarker));
 
   __ Move(rbx, Smi::FromInt(1));  // Smi indicates slow check
   __ movq(rcx, Operand(rsp, 0 * kPointerSize));  // Get enumerated object
   STATIC_ASSERT(FIRST_JS_PROXY_TYPE == FIRST_SPEC_OBJECT_TYPE);
   __ CmpObjectType(rcx, LAST_JS_PROXY_TYPE, rcx);
   __ j(above, &non_proxy);
   __ Move(rbx, Smi::FromInt(0));  // Zero indicates proxy
   __ bind(&non_proxy);
@@ skipping 3804 matching lines @@
 
   ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64