Move unsigned limits to a separate table/recognizer and display them

Move unsigned limits to a separate table/recognizer and display them
using the appropriate (unsigned) format specification.  This prevents
integer overflow when ULLONG_MAX and (on some architectures) ULONG_MAX
are used to initialize an intmax_t and then displayed as the signed
value -1.  (A different approach was suggested in the bug report,
which I did not use.)  If other limits are defined to be unsigned,
they could be moved here.

PR:		164049
Reported by:	Marcus Reid