Revert "Inline instance object hash code into object header on 64 bit."

runtime/vm/stub_code_mips.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_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1197 matching lines @@
     }
     // Successfully allocated the object(s), now update top to point to
     // next object start and initialize the object.
     __ sw(T3, Address(T5, Heap::TopOffset(space)));
     NOT_IN_PRODUCT(__ UpdateAllocationStats(cls.id(), T5, space));
 
     // T2: new object start.
     // T3: next object start.
     // T1: new object type arguments (if is_cls_parameterized).
     // Set the tags.
-    uint32_t tags = 0;
+    uword tags = 0;
     tags = RawObject::SizeTag::update(instance_size, tags);
     ASSERT(cls.id() != kIllegalCid);
     tags = RawObject::ClassIdTag::update(cls.id(), tags);
     __ LoadImmediate(T0, tags);
     __ sw(T0, Address(T2, Instance::tags_offset()));
 
     __ LoadObject(T7, Object::null_object());
 
     // Initialize the remaining words of the object.
     // T2: new object start.
@@ skipping 1221 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ break_(0);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS