PIT testing of 6u5p got failures in nsk tests when runnning with EA and BiasedLocking.
Tests passed with EA or BiasedLocking switched off.

The test failed when trying exit the monitor after deoptimization
of the compiled method with eliminated lock of scalar replaced
object.

When scalarized object is reallocated the mark word is set
to klass->prototype_header() by default. Which can have biased pattern.

But the lock should not be biased in order to safely move
the displaced mark word from the compiled frame
to the vframeArray and back to the interpreted frame.

Affected tests:
# Internal Error (synchronizer.cpp:1803), pid=XXX, tid=XXX
# Error: guarantee(mid->header()->is_neutral(),"invariant")

nsk/stress/jck12a/jck12a011
nsk/stress/jck12a/jck12a015
nsk/stress/jck12a/jck12a016
nsk/stress/jck12a/jck12a017
nsk/stress/jck60/jck60011
nsk/stress/jck60/jck60013
nsk/stress/jck60/jck60016
nsk/stress/jck60/jck60017
nsk/stress/jck60/jck60018
nsk/stress/jck60/jck60019
nsk/stress/jck60/jck60021
I see the following tests fail with the same assertion:
nsk/monitoring/stress/thread/cmon002
nsk/monitoring/stress/thread/cmon003