RFR: 8156807: Pack200 must support v53.0 class files

[Mandy Chung]

> On May 18, 2016, at 7:20 AM, Kumar Srinivasan <kumar.x.srinivasan at oracle.com> wrote:
> 
> Hi,
> 
> Alex or someone please review this simple fix, the first part is
> simply bumping the class file version number, and some cleanup
> of  redundant constants in the native unpacker.
> 
> The second part is fixing up the test, which does not read the
> process streams correctly and causes a test hang, simplified
> the test with time tested utilities.
> 
> http://cr.openjdk.java.net/~ksrini/8156807/webrev.00/

Looks okay to me.

Mandy