[AArch64] Tweak aarch64_classify_address interface

[AArch64] Tweak aarch64_classify_address interface

Previously aarch64_classify_address used an rtx code to distinguish
LDP/STP addresses from normal addresses; the code was PARALLEL
to select LDP/STP and anything else to select normal addresses.
This patch replaces that parameter with a dedicated enum.

The SVE port will add another enum value that didn't map naturally
to an rtx code.

2017-12-21  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* config/aarch64/aarch64-protos.h (aarch64_addr_query_type): New enum.
	(aarch64_legitimate_address_p): Use it instead of an rtx code,
	as an optional final parameter.
	* config/aarch64/aarch64.c (aarch64_classify_address): Likewise.
	(aarch64_legitimate_address_p): Likewise.
	(aarch64_print_address_internal): Take an aarch64_addr_query_type
	instead of an rtx code.
	(aarch64_address_valid_for_prefetch_p): Update calls accordingly.
	(aarch64_legitimate_address_hook_p): Likewise.
	(aarch64_print_ldpstp_address): Likewise.
	(aarch64_print_operand_address): Likewise.
	(aarch64_address_cost): Likewise.
	* config/aarch64/constraints.md (Uml, Umq, Ump, Utq): Likewise.
	* config/aarch64/predicates.md (aarch64_mem_pair_operand): Likewise.
	(aarch64_mem_pair_lanes_operand): Likewise.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r255911