hg: jdk-updates/jdk11u: 8214476: ZGC: Build ZGC by default

[shade at redhat.com]

Changeset: 9357712b48d7
Author:    pliden
Date:      2018-12-03 14:52 +0100
URL:       http://hg.openjdk.java.net/jdk-updates/jdk11u/rev/9357712b48d7

8214476: ZGC: Build ZGC by default
Reviewed-by: shade, rkennke, ihse

! make/autoconf/hotspot.m4
! make/conf/jib-profiles.js