[drlvm][jvmti] Request to commit HARMONY-5287 in M4

[Gregory Shimansky]

Hello

Today I found the cause of instability of jdktools tests reported by CC. 
The reason is absence of synchronization in two JVMTI functions, they 
may cause a crash in release mode since memory allocated may be less 
than actually filled up. In debug mode an assertion fails.

I'd like to commit the patch in M4 because it affects stability of 
debugging on DRLVM. Do any other committers support it?

--
Gregory