[Patch, AArch64] Vector cost model.

[Tejas Belagod]

Hi,

The attached patch implements a generic vector cost model for aarch64.

Regression tested on aarch64-none-elf.

OK?

Thanks,
Tejas Belagod.
ARM.

2013-06-25  Tejas Belagod  <tejas.belagod@arm.com>

gcc/
	* config/aarch64/aarch64-protos.h (cpu_vector_cost): New.
	(tune_params): New member 'const vec_costs'.
	* config/aarch64/aarch64.c (generic_vector_cost): New.
	(generic_tunings): New member 'generic_vector_cost'.
	(aarch64_builtin_vectorization_cost): New.
	(aarch64_add_stmt_cost): New.
	(TARGET_VECTORIZE_ADD_STMT_COST): New.
	(TARGET_VECTORIZE_BUILTIN_VECTORIZATION_COST): New.
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