RFR: 8183570: Rework is_aligned_ to avoid multiple evaluation of the size expression

[Kim Barrett]

> On Jul 5, 2017, at 6:53 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to rework is_aligned_ to avoid multiple evaluation of the size expression.
> 
> http://cr.openjdk.java.net/~stefank/8183570/webrev.00
> https://bugs.openjdk.java.net/browse/JDK-8183570
> 
> Thanks,
> StefanK

Looks good.