GEN_INT fixes

[Jeffrey A Law]

I just updated all the backends to use GEN_INT (instead of
gen_rtx (CONST_INT, ...).

It was a large number of mindless changes, but it is always possible
that I scrogged something.

The following backends were effected

1750a, arm, clipper, convex, dsp16xx, fx80, gmicro, i370, i860,
i960, m32r, m68k, m88k, ns32k, pdp11, pyr, romp, rs6000, sparc,
spur, tahoe, vax and we32k.


Let me know if this causes any problems.

jeff