#'cl-non-fixnum-number-p: return t for integers > #x3fffffff and < -#x40000000
2011-03-21 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el (cl-non-fixnum-number-p):
This should return t under 64-bit builds for fixnums that would
be bignums on a 32-bit machine; make it so.