- Make Boolean 'true' and 'false' singleton VM isolate objects.

vm/stub_code_x64.cc

 // Copyright (c) 2012, 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_X64)
 
 #include "vm/assembler.h"
 #include "vm/assembler_macros.h"
 #include "vm/compiler.h"
@@ skipping 1929 matching lines @@
   __ addq(Address(R12, count_offset), Immediate(Smi::RawValue(1)));
   __ j(NO_OVERFLOW, &compute_result);
   __ movq(Address(R12, count_offset),
           Immediate(Smi::RawValue(Smi::kMaxValue)));
 
   __ Bind(&compute_result);
   Label true_label;
   __ movq(RAX, Address(RSP, 1 * kWordSize));
   __ cmpq(RAX, Address(RSP, 2 * kWordSize));
   __ j(EQUAL, &true_label, Assembler::kNearJump);
-  __ LoadObject(RAX, Bool::ZoneHandle(Bool::False()));
+  __ LoadObject(RAX, Bool::False());
   __ ret();
   __ Bind(&true_label);
-  __ LoadObject(RAX, Bool::ZoneHandle(Bool::True()));
+  __ LoadObject(RAX, Bool::True());
   __ ret();
 
   __ Bind(&get_class_id_as_smi);
   Label not_smi;
   // Test if Smi -> load Smi class for comparison.
   __ testq(RAX, Immediate(kSmiTagMask));
   __ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
   __ movq(RAX, Immediate(Smi::RawValue(kSmiCid)));
   __ ret();
 
@@ skipping 105 matching lines @@
   __ cmpq(left, right);
   __ Bind(&done);
   __ popq(right);
   __ popq(left);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64