hg: jdk/sandbox: 8239533: ZGC: Make the ZProactive flag non-diagnostic

[chris.hegarty at oracle.com]

Changeset: 5c5dcd036a76
Author:    pliden
Date:      2020-02-24 11:01 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/5c5dcd036a76

8239533: ZGC: Make the ZProactive flag non-diagnostic
Reviewed-by: eosterlund, stefank

! src/hotspot/share/gc/z/z_globals.hpp
! test/hotspot/jtreg/gc/z/TestHighUsage.java