Remove the 1.1.81 transition code from the jdwp backend and hprof.
This was just temporary code to deal with an internal incompatibilty with the new JVMTI changes expected to be added
in with JVMTI version 1.1.81. This is not a formal compatibility issue, just one between builds of Mustang. The JVMTI functions in question have never been formally released and are new in Mustang (i.e. JVMTI FollowReferences).

Once the HotSpot VM is promoted and delivers the JVMTI 1.1.81, these changes in hprof and the debugger backend (put in with CRs 6370748 and 6370745) is no longer needed, and was just transition logic that allowed hprof and the debugger backend to work with older Mustang Hotspot's that delivered pre-1.1.81 JVMTI, and also the newer HotSpot's that delivered the post-1.1.81 JVMTI.

This CR is just to remove this Mustang JVMTI pre-1.1.81 logic in hprof and the debugger backend for final release of Mustang.