hg: ppc-aix-port/jdk7u/hotspot: Turned off ImplicitNullChecks on AIX by default because it requires UseSIGTRAP which isn't currently implemented on AIX

[volker.simonis at gmail.com]

Changeset: b69b779a26df
Author:    simonis
Date:      2012-12-13 16:21 +0100
URL:       http://hg.openjdk.java.net/ppc-aix-port/jdk7u/hotspot/rev/b69b779a26df

Turned off ImplicitNullChecks on AIX by default because it requires UseSIGTRAP which isn't currently implemented on AIX

! src/cpu/ppc/vm/globals_ppc.hpp
! src/os/aix/vm/os_aix.cpp