RFR(S): 8240854: [REDO] some jaotc failures of fastdebug build with specific flags

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/8240854/

Same as previous fix except the condition is now:

!superk->is_interface() && superk->is_abstract()

because is_abstract() returns true for interfaces.

Roland.