[9] RFR (M): 8049555: Move varargsArray from sun.invoke.util package to java.lang.invoke

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8049555/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8049555

Code cleanup:
  - moved varargsArray(Class,int) & varargsArray(int) from 
sun.invoke.util.ValueConversions to java.lang.invoke.MethodHandleImpl;
  - removed unused varargsList(int);
  - extracted relevant tests from ValueConversionsTest to VarargsArrayTest.

Testing: regression tests (jdk/java/lang/invoke, jdk/java/util/streams), 
nashorn, octane.

Thanks!

Best regards,
Vladimir Ivanov