hg: jdk/sandbox: 8239585: JFR: Native events should support empty payloads

[chris.hegarty at oracle.com]

Changeset: 207fa617f855
Author:    egahlin
Date:      2020-02-24 17:10 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/207fa617f855

8239585: JFR: Native events should support empty payloads
Reviewed-by: mgronlun

! make/src/classes/build/tools/jfr/GenerateJfrFiles.java
! src/hotspot/share/jfr/metadata/metadata.xsd