k6.md: Rewrite using the DFA model.
* config/i386/k6.md: Rewrite using the DFA model. * config/i386/i386.c (ix86_adjust_cost): Don't increase the cost of load-operation insns for the K6. (ia32_use_dfa_pipeline_interface): Add TARGET_K6. (ia32_multipass_dfa_lookahead): Likewise. From-SVN: r82859
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