[PATCH] x86, dumpstack: some more unification

[Alexander van Heukelum]

Hi Ingo, Neil,

Doing more unification of dumpstack is/was on my
TODO list, but it got sidetracked with some other
hobby projects.

I did unify oops_begin, oops_end, die and die_nmi,
and it seems to work. It needs more careful testing,
I think, but if someone (Neil?) wants to take a
look and validate the result...

Greetings,
    Alexander