VM: Reland Inline instance object hash code into object header on 64bit.

runtime/vm/stub_code_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/cpu.h"
@@ skipping 1134 matching lines @@
     __ str(R1, Address(R9, Heap::TopOffset(space)));
 
     // Load the address of the allocation stats table. We split up the load
     // and the increment so that the dependent load is not too nearby.
     NOT_IN_PRODUCT(__ LoadAllocationStatsAddress(R9, cls.id()));
 
     // R0: new object start.
     // R1: next object start.
     // R9: allocation stats table.
     // Set the tags.
-    uword tags = 0;
+    uint32_t tags = 0;
     tags = RawObject::SizeTag::update(instance_size, tags);
     ASSERT(cls.id() != kIllegalCid);
     tags = RawObject::ClassIdTag::update(cls.id(), tags);
     __ LoadImmediate(R2, tags);
     __ str(R2, Address(R0, Instance::tags_offset()));
     __ add(R0, R0, Operand(kHeapObjectTag));
 
     // Initialize the remaining words of the object.
     __ LoadObject(R2, Object::null_object());
 
@@ skipping 1161 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ bkpt(0);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM