hg: jdk7/hotspot-comp/hotspot: 6730716: nulls from two unrelated classes compare not equal

[chuck.rasbold at sun.com]

Changeset: ce93a51457ae
Author:    rasbold
Date:      2008-08-19 07:25 -0700
URL:       http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/ce93a51457ae

6730716: nulls from two unrelated classes compare not equal
Summary: check for not-nullness after proving that types are unrelated
Reviewed-by: kvn, never

! src/share/vm/opto/subnode.cpp