bool

[Torbjorn Granlund]

Having bool a 8-bit quantity does not need to be slower than having it be
the `fastest type', if the tm macro PROMOTE_MODE is set up properly.
PROMOTE_MODE has the effect of widening a type when a quantity of that type
is in a register,

Machines without byte loads/stores would still be hurt, but such machines
are rare.  Even Alpha now has byte loads, although the 21064 and early 21164
did not have them.

Torbjörn