[AArch64 costs 9/18] Better cost logical operations

[James Greenhalgh]

Hi,

Next up are costs for the logical operations (AND, OR, etc.).

Tested in series for aarch64-none-elf.

OK for stage 1?

Thanks,
James

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2014-03-27  James Greenhalgh  <james.greenhalgh@arm.com>
	    Philipp Tomsich  <philipp.tomsich@theobroma-systems.com>

	* config/aarch64/aarch64.c (aarch64_rtx_costs): Improve cost for
	logical operations.
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