Cache some global constants in Thread, to allow access via THR register.

runtime/vm/stub_code_ia32.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_IA32)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1251 matching lines @@
     case Token::kMUL: {
       __ SmiUntag(EAX);
       __ imull(EAX, EDI);
       __ j(OVERFLOW, not_smi_or_overflow, Assembler::kNearJump);
       break;
     }
     case Token::kEQ: {
       Label done, is_true;
       __ cmpl(EAX, EDI);
       __ j(EQUAL, &is_true, Assembler::kNearJump);
-      __ LoadObject(EAX, Bool::False());
+      __ LoadBoolFalse(EAX);
       __ jmp(&done, Assembler::kNearJump);
       __ Bind(&is_true);
-      __ LoadObject(EAX, Bool::True());
+      __ LoadBoolTrue(EAX);
       __ Bind(&done);
       break;
     }
     default: UNIMPLEMENTED();
   }
 
   // ECX: IC data object.
   __ movl(EBX, FieldAddress(ECX, ICData::ic_data_offset()));
   // EBX: ic_data_array with check entries: classes and target functions.
   __ leal(EBX, FieldAddress(EBX, Array::data_offset()));
@@ skipping 838 matching lines @@
 //  EBX: entry point.
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler, EDI, EBX, EBX);
   __ ret();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32