Move JSSyntaxRegExp to core as a private member. This removes the last refrences to dart:coreimpl.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1937 matching lines @@
 
   static void InitCoreLibrary(Isolate* isolate);
   static void InitCollectionLibrary(Isolate* isolate);
   static void InitMathLibrary(Isolate* isolate);
   static void InitIsolateLibrary(Isolate* isolate);
   static void InitMirrorsLibrary(Isolate* isolate);
   static void InitScalarlistLibrary(Isolate* isolate);
   static void InitNativeWrappersLibrary(Isolate* isolate);
 
   static RawLibrary* CoreLibrary();
-  static RawLibrary* CoreImplLibrary();
   static RawLibrary* CollectionLibrary();
   static RawLibrary* MathLibrary();
   static RawLibrary* IsolateLibrary();
   static RawLibrary* MirrorsLibrary();
   static RawLibrary* ScalarlistLibrary();
   static RawLibrary* NativeWrappersLibrary();
 
   // Eagerly compile all classes and functions in the library.
   static RawError* CompileAll();
 
@@ skipping 3905 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_