[ARM] Vectorise bswap* in aarch32.

[ARM] Vectorise bswap* in aarch32.

	* config/arm/neon.md (neon_bswap<mode>): New pattern.
	* config/arm/arm.c (neon_itype): Add NEON_BSWAP.
	(arm_init_neon_builtins): Handle NEON_BSWAP.
	Define required type nodes.
	(arm_expand_neon_builtin): Handle NEON_BSWAP.
	(arm_builtin_vectorized_function): Handle BUILTIN_BSWAP builtins.
	* config/arm/arm_neon_builtins.def (bswap): Define builtins.
	* config/arm/iterators.md (VDQHSD): New mode iterator.

	* lib/target-supports.exp (check_effective_target_vect_bswap):
	Specify arm*-*-* support.

From-SVN: r210967