[AArch64] Fix categorisation of the frecp* insns.

[James Greenhalgh]

Hi,

It looks like the frecp instructions got miscategorised as TARGET_FLOAT
instructions when they are in fact TARGET_SIMD instructions.

Move them to the right file, give them a simd_type, drop their "type"
and "v8type" and clean up the useless types from aarch64.md.

Also, where possible merge patterns.

Tested on aarch64-none-elf with no regression.

Thanks,
James

---
2013-09-03  James Greenhalgh   <james.greenhalgh@arm.com>

	* config/aarch64/aarch64.md
	(type): Remove frecpe, frecps, frecpx.
	(aarch64_frecp<FRECP:frecp_suffix><mode>): Move to aarch64-simd.md,
	fix to be a TARGET_SIMD instruction.
	(aarch64_frecps): Remove.
	* config/aarch64/aarch64-simd.md
	(aarch64_frecp<FRECP:frecp_suffix><mode>): New, moved from aarch64.md
 	(aarch64_frecps<mode>): Handle all float/vector of float modes.
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