hg: amber/amber/jdk: method Constables.reduce should be public

[vicente.romero at oracle.com]

Changeset: 1a3b78af1158
Author:    vromero
Date:      2017-09-19 22:30 -0400
URL:       http://hg.openjdk.java.net/amber/amber/jdk/rev/1a3b78af1158

method Constables.reduce should be public

! src/java.base/share/classes/java/lang/invoke/Constables.java