Deprecate utility method

pkg/analyzer/lib/src/generated/java_core.dart

 library java.core;
 
 const int LONG_MAX_VALUE = 0x7fffffffffffffff;
 
 final Stopwatch nanoTimeStopwatch = new Stopwatch();
 
 /**
  * Inserts the given arguments into [pattern].
  *
  *     format('Hello, {0}!', 'John') = 'Hello, John!'
@@ skipping 261 matching lines @@
     if (fromIndex > target.length) return -1;
     if (fromIndex < 0) fromIndex = 0;
     return target.lastIndexOf(str, fromIndex);
   }
   static bool startsWithBefore(String s, String other, int start) {
     return s.indexOf(other, start) != -1;
   }
 }
 
 class JavaSystem {
+  @deprecated
   static void arraycopy(
       List src, int srcPos, List dest, int destPos, int length) {
     for (int i = 0; i < length; i++) {
       dest[destPos + i] = src[srcPos + i];
     }
   }
 
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }
@@ skipping 136 matching lines @@
 
 class UnsupportedOperationException extends JavaException {
   UnsupportedOperationException([message = ""]) : super(message);
 }
 
 class URISyntaxException implements Exception {
   final String message;
   URISyntaxException(this.message);
   String toString() => "URISyntaxException: $message";
 }