[PATCH V2] Refactor tree-loop-distribution for thread safety

[Giuliano Belinassi]

Previously, the suggested patch removed all tree-loop-distributions.c global
variables moving them into a struct and passing it aroung across the functions.
This patch address this problem by using C++ classes instead, avoiding passing
the struct as argument since it will be accessible from this pointer.

gcc/ChangeLog
2019-11-14  Giuliano Belinassi  <giuliano.belinassi@usp.br>

	* cfgloop.c (get_loop_body_in_custom_order): New.
	* cfgloop.h (get_loop_body_in_custom_order): New prototype.
	* tree-loop-distribution.c (class loop_distribution): New.
	(bb_top_order_cmp): Remove.
	(bb_top_order_cmp_r): New.
	(create_rdg_vertices): Move into class loop_distribution.
	(stmts_from_loop): Same as above.
	(update_for_merge): Same as above.
	(partition_merge_into): Same as above.
	(get_data_dependence): Same as above.
	(data_dep_in_cycle_p): Same as above.
	(update_type_for_merge): Same as above.
	(build_rdg_partition_for-vertex): Same as above.
	(classify_builtin_ldst): Same as above.
	(classify_partition): Same as above.
	(share_memory_accesses): Same as above.
	(rdg_build_partitions): Same as above.
	(pg_add_dependence_edges): Same as above.
	(build_partition_graph): Same as above.
	(merge_dep_scc_partitions): Same as above.
	(break_alias_scc_partitions): Same as above.
	(finalize_partitions): Same as above.
	(distribute_loop): Same as above.
	(bb_top_order_init): New method
	(bb_top_order_destroy): New method.
	(get_bb_top_order_index_size): New method.
	(get_bb_top_order_index_index): New method.
	(get_bb_top_order_index_index): New method.
	(loop_distribution::execute): New method.
	(pass_loop_distribution::execute): Instantiate loop_distribution.
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