GCC pending_chain contains only (nil)

[Paolo Bonzini]

> pending_chain is only set in a few places, and the few places that set
> it are only called from a few places.  It should be easy to figure out
> which one is causing the problem.  Use grep to find these places, and
> put breakpoints there.  I'd guess that one of your md file patterns is
> failing.

Also, it is gone in mainline GCC.  If it is an option, consider updating 
your port to 3.5 as some complicated bits of RTL have gone away (for 
example RTX_UNCHANGING_P).

Paolo