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

runtime/vm/intermediate_language.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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 213 matching lines @@
     return String::Handle(lib.PrivateName(test_name_symbol)).Equals(name);
   }
   return name.Equals(test_name);
 }
 
 
 MethodRecognizer::Kind MethodRecognizer::RecognizeKind(
     const Function& function) {
   // Only core and math library methods can be recognized.
   const Library& core_lib = Library::Handle(Library::CoreLibrary());
-  const Library& core_impl_lib = Library::Handle(Library::CoreImplLibrary());
   const Library& math_lib = Library::Handle(Library::MathLibrary());
   const Class& function_class = Class::Handle(function.Owner());
   if ((function_class.library() != core_lib.raw()) &&
-      (function_class.library() != core_impl_lib.raw()) &&
       (function_class.library() != math_lib.raw())) {
     return kUnknown;
   }
   const Library& lib = Library::Handle(function_class.library());
   const String& function_name = String::Handle(function.name());
   const String& class_name = String::Handle(function_class.Name());
 
 #define RECOGNIZE_FUNCTION(test_class_name, test_function_name, enum_name)     \
   if (CompareNames(lib, #test_function_name, function_name) &&                 \
       CompareNames(lib, #test_class_name, class_name)) {                       \
@@ skipping 2396 matching lines @@
       return Array::length_offset();
     default:
       UNREACHABLE();
       return -1;
   }
 }
 
 #undef __
 
 }  // namespace dart