alpha.c (alpha_adjust_cost): Remove everything but memory latency adjustments.

alpha.c (alpha_adjust_cost): Remove everything but memory latency adjustments.

        * config/alpha/alpha.c (alpha_adjust_cost): Remove everything but
        memory latency adjustments.
        (alpha_variable_issue): Remove.
        (alpha_use_dfa_pipeline_interface): New.
        (alpha_multipass_dfa_lookahead): New.
        * config/alpha/alpha.md: Remove define_function_unit scheduling;
        include new dfa scheduling.
        (attr type): Add none.
        (blockage): Use it.
        * config/alpha/ev4.md: New.
        * config/alpha/ev5.md: New.
        * config/alpha/ev6.md: New.

From-SVN: r53196