[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.
From-SVN: r218007