RFR(S): 8078482: ppc: pass thread to throw_AbstractMethodError

[Lindenmaier, Goetz]

Hi,

this fixes an issue detected by Tiago Sturmer Daitix in the jdk7 ppc port.
The thread argument was left out in a call to throw_AbstractMethodError.

Please review this change.  It needs to go to jdk8u, too.  It's ppc only.
http://cr.openjdk.java.net/~goetz/webrevs/8078482-fixAME/webrev.01/

Best regards,
  Goetz.