Zap now unused builtin_mul_widen_even/odd target hooks

Zap now unused builtin_mul_widen_even/odd target hooks

        * target.def (builtin_mul_widen_even, builtin_mul_widen_odd): Remove.
        * system.h (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN): Poison.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD): Poison.
        * config/i386/i386.c (IX86_BUILTIN_VEC_WIDEN_SMUL_ODD_V4SI): Remove.
        (IX86_BUILTIN_VEC_WIDEN_SMUL_ODD_V8SI): Remove.
        (IX86_BUILTIN_VEC_WIDEN_UMUL_ODD_V4SI): Remove.
        (IX86_BUILTIN_VEC_WIDEN_UMUL_ODD_V8SI): Remove.
        (IX86_BUILTIN_VEC_WIDEN_SMUL_EVEN_V4SI): Remove.
        (IX86_BUILTIN_VEC_WIDEN_UMUL_EVEN_V4SI): Remove.
        (IX86_BUILTIN_VEC_WIDEN_UMUL_EVEN_V8SI): Remove.
        (bdesc_args): Remove entries to match.
        (ix86_builtin_mul_widen_even, ix86_builtin_mul_widen_odd): Remove.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN): Remove.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD): Remove.
        * config/rs6000/rs6000.c (rs6000_builtin_mul_widen_even): Remove.
        (rs6000_builtin_mul_widen_odd): Remove.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN): Remove.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD): Remove.
        * config/spu/spu.c (spu_builtin_mul_widen_even): Remove.
        (spu_builtin_mul_widen_odd): Remove.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN): Remove.
        (TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD): Remove.
        * doc/tm.texi.in: Don't document the removed hooks.

From-SVN: r189409