hg: jdk/jdk: 8199258: BigInteger.bitLength() should explicitly specify behavior when the value is zero

[brian.burkhalter at oracle.com]

Changeset: 6e6c3a755b89
Author:    bpb
Date:      2018-03-13 11:49 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/6e6c3a755b89

8199258: BigInteger.bitLength() should explicitly specify behavior when the value is zero
Reviewed-by: lancea, rriggs

! src/java.base/share/classes/java/math/BigInteger.java