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

runtime/vm/regexp.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.h"
 
 #include "vm/dart_entry.h"
 #include "vm/regexp_assembler.h"
 #include "vm/regexp_assembler_bytecode.h"
 #include "vm/regexp_assembler_ir.h"
@@ skipping 5258 matching lines @@
       owner,
       0));  // No token position.
 
   // TODO(zerny): Share these arrays between all irregexp functions.
   fn.set_num_fixed_parameters(kParamCount);
   fn.set_parameter_types(Array::Handle(zone, Array::New(kParamCount,
                                                            Heap::kOld)));
   fn.set_parameter_names(Array::Handle(zone, Array::New(kParamCount,
                                                            Heap::kOld)));
   fn.SetParameterTypeAt(RegExpMacroAssembler::kParamRegExpIndex,
-                        Type::Handle(zone, Type::DynamicType()));
+                        Object::dynamic_type());
   fn.SetParameterNameAt(RegExpMacroAssembler::kParamRegExpIndex,
                         Symbols::This());
   fn.SetParameterTypeAt(RegExpMacroAssembler::kParamStringIndex,
-                        Type::Handle(zone, Type::DynamicType()));
+                        Object::dynamic_type());
   fn.SetParameterNameAt(RegExpMacroAssembler::kParamStringIndex,
                         Symbols::string_param());
   fn.SetParameterTypeAt(RegExpMacroAssembler::kParamStartOffsetIndex,
-                        Type::Handle(zone, Type::DynamicType()));
+                        Object::dynamic_type());
   fn.SetParameterNameAt(RegExpMacroAssembler::kParamStartOffsetIndex,
                         Symbols::start_index_param());
   fn.set_result_type(Type::Handle(zone, Type::ArrayType()));
 
   // Cache the result.
   regexp.set_function(specialization_cid, fn);
 
   fn.SetRegExpData(regexp, specialization_cid);
   fn.set_is_debuggable(false);
 
@@ skipping 28 matching lines @@
   CreateSpecializedFunction(zone, regexp, kOneByteStringCid, owner);
   CreateSpecializedFunction(zone, regexp, kTwoByteStringCid, owner);
   CreateSpecializedFunction(zone, regexp, kExternalOneByteStringCid, owner);
   CreateSpecializedFunction(zone, regexp, kExternalTwoByteStringCid, owner);
 
   return regexp.raw();
 }
 
 
 }  // namespace dart