[8u] backport RFR (XS) 8049252: VerifyStack logic in Deoptimization::unpack_frames does not expect to see invoke bc at the top frame during normal deoptimization

[Vladimir Kozlov]

8u (8u40) backport request. The fix was pushed into jdk9 week ago and 
nightly testing shows no related problems.

Changes from jdk9 applied to 8u without conflicts.

http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/860d53992be0
https://bugs.openjdk.java.net/browse/JDK-8049252
http://cr.openjdk.java.net/~kvn/8049252/webrev

Thanks,
Vladimir