[AArch64 costs 13/18] Improve costs for div/mod

[James Greenhalgh]

Hi,

Now DIV/MOD.

Tested in series on aarch64-none-elf.

OK for stage 1?

Thanks,
James

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

	* config/aarch64/aarch64.c (aarch64_rtx_costs): Improve costs for
	DIV/MOD.
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