VM: Use read-only handle Object::dynamic_type() where possible.

runtime/vm/intrinsifier_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.
 //
 // The intrinsic code below is executed before a method has built its frame.
 // The return address is on the stack and the arguments below it.
 // Registers EDX (arguments descriptor) and ECX (function) must be preserved.
 // Each intrinsification method returns true if the corresponding
 // Dart method was intrinsified.
 
@@ skipping 59 matching lines @@
     __ j(EQUAL, &checked_ok, Assembler::kNearJump);
 
     __ movl(EBX, Address(ESP, + 3 * kWordSize));  // Array.
     __ movl(EBX, FieldAddress(EBX, type_args_field_offset));
     // EBX: Type arguments of array.
     __ cmpl(EBX, raw_null);
     __ j(EQUAL, &checked_ok, Assembler::kNearJump);
     // Check if it's dynamic.
     // Get type at index 0.
     __ movl(EAX, FieldAddress(EBX, TypeArguments::type_at_offset(0)));
-    __ CompareObject(EAX, Type::ZoneHandle(Type::DynamicType()));
+    __ CompareObject(EAX, Object::dynamic_type());
     __ j(EQUAL,  &checked_ok, Assembler::kNearJump);
     // Check for int and num.
     __ testl(EDI, Immediate(kSmiTagMask));  // Value is Smi?
     __ j(NOT_ZERO, &fall_through);  // Non-smi value.
     __ CompareObject(EAX, Type::ZoneHandle(Type::IntType()));
     __ j(EQUAL,  &checked_ok, Assembler::kNearJump);
     __ CompareObject(EAX, Type::ZoneHandle(Type::Number()));
     __ j(NOT_EQUAL, &fall_through);
     __ Bind(&checked_ok);
   }
@@ skipping 2062 matching lines @@
 void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
   __ LoadIsolate(EAX);
   __ movl(EAX, Address(EAX, Isolate::current_tag_offset()));
   __ ret();
 }
 
 #undef __
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32