[Patch, ARM][2/2] Create tune for Cortex-A15.

[Greta Yorsh]

This patch creates a new tune_param structure for Cortex-A15. The new tune
is identical to the generic cortex tune used for Cortex-A15 before this
patch, except the field prefer_ldrd_strd is set to true. This field will be
used by subsequent patches, in particular for prologue/epilogue.

Ok for trunk?

Thanks,
Greta

Changelog

gcc/

2012-07-20  Sameera Deshpande  <sameera.deshpande@arm.com>
            Greta Yorsh  <Greta.Yorsh@arm.com>

        * config/arm/arm.c (arm_cortex_a15_tune): New tune.
        * config/arm/arm-cores.def (cortex-a15): Use new tune.
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