RFR (S) 8222231: Clean up interfaceSupport.inline.hpp duplicated code

[coleen.phillimore at oracle.com]

Some code was left from removing code UseMembar and further improvements 
encouraged by dholmes.  I also removed a couple redundant and unneeded 
clear_unhandled_oops calls.  The one in ThreadBlockInVMWithDeadlockCheck 
is in the calling code Monitor::lock, and the thread in vm from native 
makes no sense.

Tested with runtime jtreg tests, and mach5 tier1-3 in progress.

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8222231.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8222231

Thanks,
Coleen