Revert "Removes dartc reliance on its own libraries, now can be targeted at any implementation's li…

compiler/lib/implementation/core.dart

+// Copyright (c) 2011, 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.
+
+class ConstHelper {
+  static String getConstId(var o) native;
+
+  static String getConstMapId(Map map) native {
+    StringBuffer sb = new StringBuffer();
+    sb.add("m");
+    bool first = true;
+    for (String key in map.getKeys()) {
+      if (first) {
+        first = false;
+      } else {
+        sb.add(",");
+      }
+      sb.add(getConstId(key));
+      sb.add(",");
+      sb.add(getConstId(map[key]));
+    }
+    return sb.toString();
+  }
+}
+
+class ExceptionHelper {
+  static NullPointerException createNullPointerException() native {
+    return new NullPointerException();
+  }
+
+  static ObjectNotClosureException createObjectNotClosureException() native {
+    return new ObjectNotClosureException();
+  }
+
+  static NoSuchMethodException createNoSuchMethodException(
+      receiver, functionName, arguments) native {
+    return new NoSuchMethodException(receiver, functionName, arguments);
+  }
+
+  static TypeError createTypeError(String srcType, String dstType) native {
+    return new TypeError(srcType, dstType);
+  }
+  
+  static AssertionError createAssertionError() native {
+    return new AssertionError();
+  }
+}
+
+class _CoreJsUtil {
+  static Map _newMapLiteral() native {
+    return new LinkedHashMap();
+  }
+}
+