The intent of this target is to run our test suite against the installed jre.
This should help prevent our VM from diverging in implementation from the jdk.
The remainder of this commit fixes the problems that this exposes.
This mainly moves several sun.misc.Unsafe method implementations from
classpath-openjdk.cpp to builtin.cpp so that the Avian and Android
builds can use them.
It also replaces FinalizerReference.finalizeAllEnqueued with a no-op,
since the real implementations assumes too much about how the VM
handles (or delegates) finalization.
