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

runtime/vm/class_finalizer.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/class_finalizer.h"
 
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
@@ skipping 234 matching lines @@
     String& super_class_name = String::Handle(super_class.Name());
     const Script& script = Script::Handle(cls.script());
     ReportError(script, cls.token_pos(),
                 "class '%s' and superclass '%s' are not "
                 "both classes or both interfaces",
                 class_name.ToCString(),
                 super_class_name.ToCString());
   }
   // If cls belongs to core lib or to core lib's implementation, restrictions
   // about allowed interfaces are lifted.
-  if ((cls.library() != Library::CoreLibrary()) &&
-      (cls.library() != Library::CoreImplLibrary())) {
+  if (cls.library() != Library::CoreLibrary()) {
     // Prevent extending core implementation classes.
     bool is_error = false;
     switch (super_class.id()) {
       case kNumberCid:
       case kIntegerCid:
       case kSmiCid:
       case kMintCid:
       case kBigintCid:
       case kDoubleCid:
       case kOneByteStringCid:
@@ skipping 1115 matching lines @@
   }
 
   // If the class/interface has no explicit interfaces, we are done.
   Array& super_interfaces = Array::Handle(cls.interfaces());
   if (super_interfaces.Length() == 0) {
     return;
   }
 
   // If cls belongs to core lib or to core lib's implementation, restrictions
   // about allowed interfaces are lifted.
-  const bool cls_belongs_to_core_lib =
-      (cls.library() == Library::CoreLibrary()) ||
-      (cls.library() == Library::CoreImplLibrary());
+  const bool cls_belongs_to_core_lib = cls.library() == Library::CoreLibrary();
 
   // Resolve and check the interfaces of cls.
   visited->Add(cls_index);
   AbstractType& interface = AbstractType::Handle();
   Class& interface_class = Class::Handle();
   for (intptr_t i = 0; i < super_interfaces.Length(); i++) {
     interface ^= super_interfaces.At(i);
     ResolveType(cls, interface, kCanonicalizeWellFormed);
     if (interface.IsTypeParameter()) {
       const Script& script = Script::Handle(cls.script());
@@ skipping 213 matching lines @@
 void ClassFinalizer::ReportError(const char* format, ...) {
   va_list args;
   va_start(args, format);
   const Error& error = Error::Handle(
       Parser::FormatError(Script::Handle(), -1, "Error", format, args));
   va_end(args);
   ReportError(error);
 }
 
 }  // namespace dart