RFR: 8231993: Remove redundant pkg_str param from is_shared_class_visible_for_classloader

[Claes Redestad]

Hi,

please review this trivial(?) fix to remove the redundant pkg_str
parameter from is_shared_class_visible_for_classloader

Bug:    https://bugs.openjdk.java.net/browse/JDK-8231993
Webrev: http://cr.openjdk.java.net/~redestad/8231993/open.00/

Testing: tier1+2

Thanks!

/Claes