libgcc2 and MIN_UNITS_PER_WORD on ia64

[David Edelsohn]

>>>>> Alexandre Oliva writes:

Alexandre> FWIW, I've just fixed (but not installed yet; will do momentarily) at
Alexandre> least some of the bugs in codegen and in the ppc back-end, that
Alexandre> prevented the adoption of the patch that automatically selected `long
Alexandre> long' for HOST_WIDE_INT if the target has 64-bits wide longs, which
Alexandre> obviates the ugly hack we currently have.

	I hope that you will allow me to review the patches for the ppc
back-end before you commit them.

David