Use patching for regexp implementation.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 1582 matching lines @@
   const GrowableObjectArray& new_functions = GrowableObjectArray::Handle(
       GrowableObjectArray::New(orig_len));
   for (intptr_t i = 0; i < orig_len; i++) {
     orig_func ^= orig_list.At(i);
     member_name = orig_func.name();
     func = patch.LookupFunction(member_name);
     if (func.IsNull()) {
       // Non-patched function is preserved, all patched functions are added in
       // the loop below.
       new_functions.Add(orig_func);
-    } else if (!func.HasCompatibleParametersWith(orig_func)) {
+    } else if (!func.HasCompatibleParametersWith(orig_func) &&
+               !(func.IsFactory() && orig_func.IsConstructor() &&
+                 (func.num_fixed_parameters() + 1 ==
+                  orig_func.num_fixed_parameters()))) {
       return FormatPatchError("mismatched parameters: %s", member_name);
     }
   }
   for (intptr_t i = 0; i < patch_len; i++) {
     func ^= patch_list.At(i);
     func.set_owner(patch_class);
     new_functions.Add(func);
   }
   Array& new_list = Array::Handle(Array::MakeArray(new_functions));
   SetFunctions(new_list);
@@ skipping 9540 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart