[PATCH][ARM] Cortex-A8 rtx cost table

[Kyrill Tkachov]

Hi all,

This patch adds the rtx cost table for the Cortex-A8 core. It's an ARMv7 core, 
so it goes into arm.c instead of aarch-cost-tables.h.

Bootstrapped and tested on a Cortex-A8 Linux system and benchmarked to make sure 
no performance regressions. There are various small improvements here and there.

Ok for next stage 1?

Thanks,
Kyrill

2013-03-25  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/arm/arm.c (cortexa8_extra_costs): New table.
     (arm_cortex_a8_tune): New tuning struct.
     * config/arm/arm-cores.def (cortex-a8): Use cortex_a8 tuning struct.
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