Create a symbol before setting the irregexp function name.

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_ast.h"
 #include "vm/unibrow-inl.h"
@@ skipping 5085 matching lines @@
 
 
 static void CreateSpecializedFunction(Isolate* isolate,
                                       const JSRegExp& regexp,
                                       intptr_t specialization_cid,
                                       const Object& owner) {
   const intptr_t kParamCount = RegExpMacroAssembler::kParamCount;
 
   Function& fn = Function::Handle(isolate, Function::New(
       // Append the regexp pattern to the function name.
-      String::Handle(isolate, String::Concat(
+      String::Handle(isolate, Symbols::New(
           String::Handle(isolate, String::Concat(
-              Symbols::Irregexp(),
-              Symbols::ColonSpace(), Heap::kOld)),
-          String::Handle(regexp.pattern()), Heap::kOld)),
+              String::Handle(isolate, String::Concat(
+                  Symbols::Irregexp(),
+                  Symbols::ColonSpace(), Heap::kOld)),
+              String::Handle(regexp.pattern()), Heap::kOld)))),
       RawFunction::kIrregexpFunction,
       true,  // Static.
       false,  // Not const.
       false,  // Not abstract.
       false,  // Not external.
       false,  // Not native.
       owner,
       0));  // No token position.
 
   // TODO(zerny): Share these arrays between all irregexp functions.
@@ skipping 46 matching lines @@
   CreateSpecializedFunction(isolate, regexp, kOneByteStringCid, owner);
   CreateSpecializedFunction(isolate, regexp, kTwoByteStringCid, owner);
   CreateSpecializedFunction(isolate, regexp, kExternalOneByteStringCid, owner);
   CreateSpecializedFunction(isolate, regexp, kExternalTwoByteStringCid, owner);
 
   return regexp.raw();
 }
 
 
 }  // namespace dart