[PATCH AArch64] Refactor aarch64_mov_operand predicate.

[Marcus Shawcroft]

This patch refactors the current implementation of the 
aarch64_mov_operand predicate in preparation for the addition of further 
memory models.  Regressed for aarch64-none-elf. Applied.

/Marcus

2013-05-23  Chris Schlumberger-Socha <chris.schlumberger-socha@arm.com>
	    Marcus Shawcroft  <marcus.shawcroft@arm.com>

	* config/aarch64/aarch64-protos.h (aarch64_mov_operand_p): Define.
	* config/aarch64/aarch64.c (aarch64_mov_operand_p): Define.
	* config/aarch64/predicates.md (aarch64_const_address): Remove.
	(aarch64_mov_operand): Use aarch64_mov_operand_p.
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