hg: jdk/jdk: 8167493: Test that JFR event can be retransformed by an agent

[mikhailo.seledtsov at oracle.com]

Changeset: 328ba6a75f41
Author:    mseledtsov
Date:      2020-02-18 08:14 -0800
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/328ba6a75f41

8167493: Test that JFR event can be retransformed by an agent
Summary: Added new test, extended agent builder test library
Reviewed-by: egahlin

+ test/jdk/jdk/jfr/javaagent/InstrumentationEventCallback.java
+ test/jdk/jdk/jfr/javaagent/TestEventInstrumentation.java
! test/lib/jdk/test/lib/util/JavaAgentBuilder.java