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

[mandy chung]

http://cr.openjdk.java.net/~mchung/jdk10/webrevs/8193325/webrev.00/

This fixes the bug in hotspot that sets the bci field as int but it's of 
short type and also StackFrameInfo to return a proper bci value.  Coleen 
suggests not to change set_bci to take jushort but instead do the cast 
as in the proposed fix.  The VM is in favor of C++ types and stop 
propagation of Java types.  bci is of int in VM implementation and so be 
consistent.

Mandy
[1] mail.openjdk.java.net/pipermail/core-libs-dev/2017-December/050581.html