spu: Use the FMA rtx code.

        * config/spu/spu.md (fma<VSF>4): Rename from fma_<VSF>.
        (fnma<VSF>4): Rename from fnms_<VSF>.
        (fms<VSF>4): Rename from fms_<VSF>.
        (fma<VDF>4): Rename from fma_<VDF>.
        (fms<VDF>4): Rename from fms_<VDF>.
        (nfma<VDF>4): Rename from fnma_<VDF>.
        (nfms<VDF>4): Rename from fnms_<VDF>.
        (fnma<VDF>4, fnms<VDF>4): New expanders.
        (floatunsdisf2): Update for the renames.
        (*div<VSF>3_fast, *div<VSF>3_adjusted): Likewise.
        * config/spu/spu-builtins.def: Update CODE_FOR_* for the renames.

From-SVN: r166833