Java 8 RFR 8020641: Clean up some code style in recent BigInteger contributions

[Brian Burkhalter]

Reviewers:

Issue	http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8020641 (will be public soon)
Webrev	http://cr.openjdk.java.net/~bpb/8020641/

Note that this patch will need to be integrated after the one for 8014319 which is pending approval [1].

Thanks,

Brian

[1] http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-July/018922.html