rs6000.c (union_defs, [...]): Move all code related to p8 swap optimizations to file rs6000-p8swap.c.

2017-07-06  Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (union_defs, union_uses, insn_is_load_p,
	insn_is_store_p, insn_is_swap_p, const_load_sequence_p, v2df_reduction_p,
	rtx_is_swappable_p, insn_is_swappable_p, chain_contains_only_swaps,
	mark_swaps_for_removal, swap_const_vector_halves, adjust_subreg_index,
	permute_load, permute_store, adjust_extract, adjust_splat,
	adjust_xxpermdi, adjust_concat, adjust_vperm, handle_special_swappables,
	replace_swap_with_copy, dump_swap_insn_table,
	alignment_with_canonical_addr, alignment_mask, find_alignment_op,
	recombine_lvx_pattern, recombine_stvx_pattern,
	recombine_lvx_stvx_patterns, rs6000_analyze_swaps,
	make_pass_analyze_swaps): Move all code related to p8 swap optimizations
	to file rs6000-p8swap.c.
	* config/rs6000/rs6000-p8swap.c: New file.
	* config/rs6000/t-rs6000: Add rule to build rs6000-p8swap.o.
	* config.gcc: Add rs6000-p8swap.o to extra_objs for powerpc*-*-*
	and rs6000*-*-* targets.

From-SVN: r250040