RFR JDK-8193325: StackFrameInfo::getByteCodeIndex returns wrong value if bci > 32767

[Mandy Chung]

An earlier version of this patch was reviewed [1] but I
didn't get back to explore the other approach.  I rebase
the patch and take out the hotspot change which will be
covered by JDK-8229375:

http://cr.openjdk.java.net/~mchung/jdk14//8193325/webrev.01

David - can you re-review it?

thanks
Mandy
[1] 
https://mail.openjdk.java.net/pipermail/core-libs-dev/2017-December/050590.html