Patch: rs6000: Improve rtx_costs

[Dale Johannesen]

This improves the rtx_costs computation for DIV and MOD, in
particular with power-of-2 denominator.  Bootstrapped and
tested on Darwin.  OK?

2004-08-20  Dale Johannesen  <dalej@apple.com>

         * config/rs6000/rs6000.c (rs6000_rtx_costs): Improve DIV/MOD.

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