[basic-improvements] split config.h and tm.h, steps 1+2

[Zack Weinberg]

Jan Hubicka <jh@suse.cz> writes:

> Zack,
> you forgot to commit coretypes.h.  I've just did that so we can
> bootstrap again.

No part of that patch was supposed to be applied to the mainline.
I've just backed out the changes to unwind-dw2-fde-darwin.c and
removed coretypes.h from the mainline again.  I'm not sure how that
happened -- I think I might have had an inconsistent working copy.
Apologies.

coretypes.h should still be visible on the basic-improvements branch.
Could y'all give it another spin?

zw