(cpu attribute): Rename to arch attribute.

(cpu attribute): Rename to arch attribute.  Add a new
cpu attribute.  Fix all users.
(type attribute): Add ialu, shift, imul, fpdivs, and fpdivd.
Delete fpdiv.
(function units): Add Cypress and Supersparc versions of each.
(addsi3, subsi3, andsi3, iorsi3, xorsi3): Add ialu type attribute.
(mulsi3): Add imul type attribute.
(divtf3, divdf3): Use fpdivd not fpdiv type attribute.
(divsf3); Use fpdivs not fpdiv type attribute.
(ashlsi3, ashrsi3, lshrsi3): Add shift type attribute.

From-SVN: r7586