[AArch64] Rewrite vabs<q>_s<8,16,32,64> AdvSIMD intrinsics to fold to tree.

[James Greenhalgh]

Hi,

This patch uses aarch64_fold_builtin to fold all remaining variants
of the vabs intrinsics to tree.

Testcase added, full testsuite run for aarch64-none-elf with no
issues.

OK?

Thanks,
James

---
gcc/

2013-07-19  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/aarch64/aarch64-builtins.c
	(aarch64_fold_builtin): Fold abs in all modes.
	* config/aarch64/aarch64-simd-builtins.def
	(abs): Enable for all modes.
	* config/aarch64/arm_neon.h
	(vabs<q>_s<8,16,32,64): Rewrite using builtins.
	(vabs_f64): Add missing intrinsic.

gcc/testsuite/

2013-07-19  James Greenhalgh  <james.greenhalgh@arm.com>

	* gcc.target/aarch64/vabs_intrinsic_1.c: New file.
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