10 RFR: 8169039: Add unit tests for BitMap search operations

[Kim Barrett]

Looking for reviewers.

> On Feb 18, 2017, at 12:58 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
> Please review this change to add a native unit test for BitMap search
> operations, e.g. get_next_{zero,one}_offset and variants.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8169039
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8169039/hotspot.00/