RFR(XS) 8148785: Update class file version to 53 for JDK-9

[Aleksey Shipilev]

On 02/03/2016 04:16 PM, harold seigel wrote:
> Open webrevs:
>       http://cr.openjdk.java.net/~hseigel/bug_8148785.jdk/
>       http://cr.openjdk.java.net/~hseigel/bug_8148785.hs/

+1

> JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8148785

Description seems to imply we change the compiled class file versions to
53.0. But this change only makes VM to accept 53.0, it does not actually
produce 53.0 files yet. Are we sure the patches do what 8148785 intended?

Anyhow, there seems to be little risk with this particular change.

-Aleksey