8246183: Scanner/ScanTest.java fails due to SIGSEGV in StubRoutines::jshort_disjoint_arraycopy

[Brian Burkhalter]

Please review this fix [1] for [2]. It in effect just backs out the recent fix 
for [3]. I’ll investigate the root cause next week.

Thanks,

Brian

[1] http://cr.openjdk.java.net/~bpb/8246183/webrev.00/
[2] https://bugs.openjdk.java.net/browse/JDK-8246183
[3] https://bugs.openjdk.java.net/browse/JDK-8245121