models of type sizes that we currently support, and include
the appropriate one in each arch's targparam.h.
* Use the type size constants provided by targparam.h in the
type table, rather than using "sizeof(type) * CHAR_BIT" (which
would get the host's type size, not the target's). XXX Not
yet done for floating point types.
* Add a new BITFIELDTYPE lint comment that suppresses illegal
bitfield type errors if the type is an integer type (e.g.
long, long long), and also suppresses non-portable bitfield
type warnings.