review (XS) for 6921992: failure in verify scheduling after 6792161

[Vladimir Kozlov]

Changes look good.

Tom, was 679216 case rare? Can we live without the fix?

Thanks,
Vladimir

Tom Rodriguez wrote:
> http://cr.openjdk.java.net/~never/6921992
> 
> 6921992: failure in verify scheduling after 6792161
> Reviewed-by:
> 
> The fix for 6792161 created problems with the scheduler verification
> logic so until I find a better for 6792161 I'm backing it out.  This
> is just an anti-delta for the original fix.
> 
> src/share/vm/opto/ifg.cpp
> 
> The previous changeset was http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/0e14bd797dad