hg: jdk/sandbox: 8152910: Get performance improvement with Stable annotation

[chris.hegarty at oracle.com]

Changeset: c7f7d824f2b6
Author:    bpb
Date:      2018-10-10 17:53 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/c7f7d824f2b6

8152910: Get performance improvement with Stable annotation
Reviewed-by: darcy
Contributed-by: Peter Levart <peter.levart at gmail.com>

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