hg: jdk7/hotspot-comp/hotspot: 6709742: find_base_for_derived's use of Ideal NULL is unsafe causing crashes during register allocation

[vladimir.kozlov at sun.com]

Changeset: 04fa5affa478
Author:    kvn
Date:      2009-04-22 17:03 -0700
URL:       http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/04fa5affa478

6709742: find_base_for_derived's use of Ideal NULL is unsafe causing crashes during register allocation
Summary: Create a mach node corresponding to ideal node ConP #NULL specifically for derived pointers.
Reviewed-by: never

! src/share/vm/opto/buildOopMap.cpp
! src/share/vm/opto/chaitin.cpp
! src/share/vm/opto/matcher.cpp
! src/share/vm/opto/matcher.hpp