RFR: 8076470 - JEP 240: Remove the JVM TI hprof Agent

[Staffan Larsen]

Please review the following changes to remove the hprof JVMTI agent. There are changes in three different repositories. All tests that used the hprof agent has been removed in previous changesets. 

Note: This does not remove the ability of the Hotspot VM to output heap dumps in the hprof format.

bug: https://bugs.openjdk.java.net/browse/JDK-8046661 <https://bugs.openjdk.java.net/browse/JDK-8046661>

top-level changes: http://cr.openjdk.java.net/~sla/8076470/root/webrev.00/ <http://cr.openjdk.java.net/~sla/8076470/root/webrev.00/>
jdk changes: http://cr.openjdk.java.net/~sla/8076470/jdk/webrev.00/ <http://cr.openjdk.java.net/~sla/8076470/jdk/webrev.00/>
hotspot changes: http://cr.openjdk.java.net/~sla/8076470/hotspot/webrev.00/ <http://cr.openjdk.java.net/~sla/8076470/hotspot/webrev.00/>

Thanks,
/Staffan