0.8.3.45.modular6:

0.8.3.45.modular6:
	Implement 64-bit modular arithmetic for alpha.
	... can't simplify BIGNUM-LOGNOT or 32BIT-LOGICAL-FOO here,
		because modular arithmetic is 64-bit, duh :-)
	... it would be nice to compile (logand ... (1- (ash 1 32)))
		more efficiently than we currently do; currently we
		load up a 32-bit quantity into a register, followed
		by an and instruction; however, we should be able
		simply to do mskll reg, 4, reg.
	I think this works.  Simple testing shows that it seems to work.
	But see also CSR sbcl-devel 2003-09-12, because there are a number
	of nasty surprises lurking in the depths of this backend.