GDB `cannotfix' pr state, require PR with xfail `moving forward'.

[Andrew Cagney]

> In that case I'd want "broken in all GCC's" to be open rather than
> suspended.  Does this bother anyone?

Yes, that bothers me, it would be wrong.  The only time a PR is in the 
open state is when no one has looked at it.  As soon as someone looks at 
the PR, it should be changed from open to some other state - analized, 
suspended, closed, ...

Andrew