[ARM][1/3] Add rev field to rtx cost tables
* config/arm/aarch-common-protos.h (alu_cost_table): Add rev field. * config/arm/aarch-cost-tables.h (generic_extra_costs): Specify rev cost. (cortex_a53_extra_costs): Likewise. (cortex_a57_extra_costs): Likewise. * config/arm/arm.c (cortexa9_extra_costs): Likewise. (cortexa7_extra_costs): Likewise. (cortexa8_extra_costs): Likewise. (cortexa12_extra_costs): Likewise. (cortexa15_extra_costs): Likewise. (v7m_extra_costs): Likewise. (arm_new_rtx_costs): Handle BSWAP. From-SVN: r209703
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