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

runtime/vm/regexp_assembler_ir.cc

 // Copyright (c) 2014, 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/regexp_assembler_ir.h"
 
 #include "vm/bit_vector.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 364 matching lines @@
 }
 
 
 DEFINE_RAW_LEAF_RUNTIME_ENTRY(
     CaseInsensitiveCompareUC16, 4, false /* is_float */,
     reinterpret_cast<RuntimeFunction>(&CaseInsensitiveCompareUC16));
 
 
 LocalVariable* IRRegExpMacroAssembler::Parameter(const String& name,
                                                  intptr_t index) const {
-  const Type& local_type = Type::ZoneHandle(Z, Type::DynamicType());
   LocalVariable* local =
-      new(Z) LocalVariable(kNoSourcePos, name, local_type);
+      new(Z) LocalVariable(kNoSourcePos, name, Object::dynamic_type());
 
   intptr_t param_frame_index = kParamEndSlotFromFp + kParamCount - index;
   local->set_index(param_frame_index);
 
   return local;
 }
 
 
 LocalVariable* IRRegExpMacroAssembler::Local(const String& name) {
-  const Type& local_type = Type::ZoneHandle(Z, Type::DynamicType());
   LocalVariable* local =
-      new(Z) LocalVariable(kNoSourcePos, name, local_type);
+      new(Z) LocalVariable(kNoSourcePos, name, Object::dynamic_type());
   local->set_index(GetNextLocalIndex());
 
   return local;
 }
 
 
 ConstantInstr* IRRegExpMacroAssembler::Int64Constant(int64_t value) const {
   return new(Z) ConstantInstr(
         Integer::ZoneHandle(Z, Integer::New(value, Heap::kOld)));
 }
@@ skipping 1516 matching lines @@
       index_val,
       characters,
       specialization_cid_,
       Scanner::kNoSourcePos));
 }
 
 
 #undef __
 
 }  // namespace dart