hg: jdk/sandbox: Initial changes for JDK-8246436

[erik.gahlin at oracle.com]

Changeset: dbccf24a48dc
Author:    egahlin
Date:      2020-06-06 02:30 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/dbccf24a48dc

Initial changes for JDK-8246436

! make/hotspot/gensrc/GensrcJfr.gmk
! make/src/classes/build/tools/jfr/GenerateJfrFiles.java
- src/jdk.jfr/share/classes/jdk/jfr/internal/MetadataHandler.java
+ src/jdk.jfr/share/classes/jdk/jfr/internal/MetadataLoader.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/TypeLibrary.java