rs6000: Rename patterns for vec_widen_<s>mult_even/odd_<mode>

rs6000: Rename patterns for vec_widen_<s>mult_even/odd_<mode>

        * config/rs6000/altivec.md (vec_widen_umult_even_v16qi): Rename
        from altivec_vmuleub.
        (vec_widen_smult_even_v16qi): Rename from altivec_vmulesb.
        (vec_widen_umult_even_v8hi): Rename from altivec_vmuleuh.
        (vec_widen_smult_even_v8hi): Rename from altivec_vmulesh.
        (vec_widen_umult_odd_v16qi): Rename from altivec_vmuloub.
        (vec_widen_smult_odd_v16qi): Rename from altivec_vmulosb.
        (vec_widen_umult_odd_v8hi): Rename from altivec_vmulouh.
        (vec_widen_smult_odd_v8hi): Rename from altivec_vmulosh.
        * config/rs6000/rs6000-builtin.def: Update pattern names to match.

From-SVN: r189405