[AArch64][1/5] Implement TARGET_SCHED_MACRO_FUSION_PAIR_P

[AArch64][1/5] Implement TARGET_SCHED_MACRO_FUSION_PAIR_P

	* config/aarch64/aarch64-protos.h (struct tune_params): Add
	fuseable_ops field.
	* config/aarch64/aarch64.c (generic_tunings): Specify fuseable_ops.
	(cortexa53_tunings): Likewise.
	(cortexa57_tunings): Likewise.
	(thunderx_tunings): Likewise.
	(aarch64_macro_fusion_p): New function.
	(aarch_macro_fusion_pair_p): Likewise.
	(TARGET_SCHED_MACRO_FUSION_P): Define.
	(TARGET_SCHED_MACRO_FUSION_PAIR_P): Likewise.
	(AARCH64_FUSE_MOV_MOVK): Likewise.
	(AARCH64_FUSE_NOTHING): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218007 138bc75d-0d04-0410-961f-82ee72b054a4