hg: jdk-updates/jdk11u-dev: 8241464: [11u] Backport: make rehashing be a needed guaranteed safepoint cleanup action

[martin.doerr at sap.com]

Changeset: f5d733849dc9
Author:    mdoerr
Date:      2020-03-25 11:04 +0100
URL:       https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/f5d733849dc9

8241464: [11u] Backport: make rehashing be a needed guaranteed safepoint cleanup action
Summary: Backport part of JDK-8221967.
Reviewed-by: coleenp, lucy, clanger

! src/hotspot/share/runtime/safepoint.cpp