[PATCH, ARM] Clean up arm backend using the @ construct for MD patterns

[PATCH, ARM] Clean up arm backend using the @ construct for MD patterns

This patch removes some of the machine mode checks from the arm backend when
emitting instructions by using the '@' construct (Parameterized Names[2]). It
is based on the previous AArch64 patch[1].

[1] https://gcc.gnu.org/ml/gcc-patches/2018-07/msg00673.html
[2] https://gcc.gnu.org/onlinedocs/gccint/Parameterized-Names.html#Parameterized-Names

2018-23-11  Mihail Ionescu  <mihail.ionescu@arm.com>

	* config/arm/arm.c (arm_expand_compare_and_swap): Simplify and call
	gen_atomic_compare_swap_1.
	(arm_evpc_neon_vuzp): Likewise gen_neon_vuzp_internal.
	(arm_evpc_neon_vtrn): Likewise gen_neon_vtrn_internal.
	(arm_evpc_neon_vext): Likewise gen_neon_vext_internal.
	(arm_evpc_neon_vzip): Likewise gen_neon_vzip_internal.
	(arm_evpc_neon_vrev): Replace the function pointer and simplify the mode
	checks.
	* config/arm/arm.md (neon_vext<mode>),
	(neon_vrev64<mode>, neon_vrev32<mode>),
	(neon_vrev16<mode>, neon_vtrn<mode>_internal),
	(neon_vzip<mode>_internal, neon_vuzp<mode>_internal): Add an '@'character
	before the pattern name.
	* config/arm/sync.md:
	(atomic_compare_and_swap<CCSI:arch><NARROW:mode>_1),
	(atomic_compare_and_swap<CCSI:arch><SIDI:mode>_1): Likewise.

From-SVN: r266404