[AArch64 Refactor] Use emit_set_insn more frequently

[James Greenhalgh]

Hi,

I was just flicking through the AArch64 back end and spotted the
little-used "emit_set_insn" function.

I was going to remove it, as it had only one user, but actually it
is an inoffensive little abstraction, so I've applied it throughout
aarch64.c

Bootstrapped on aarch64-none-linux-gnu.

Marcus, Richard, do you want this churn now or in Stage 1?

Cheers,
James

---
2015-02-17  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/aarch64/aarch64.c (aarch64_internal_mov_immediate): Use
	emit_set_insn to emit simple sets.
	(aarch64_expand_mov_immediate): Likewise.
	(aarch64_expand_compare_and_swap): Likewise.
	(aarch64_split_compare_and_swap): Likewise.
	(aarch64_split_atomic_op): Likewise.
	(aarch64_gen_adjusted_ldpstp): Likewise.
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