re PR tree-optimization/71437 (Performance regression after r235817)

re PR tree-optimization/71437 (Performance regression after r235817)

	PR tree-optimization/71437
	* tree-ssa-dom.c (struct cond_equivalence): Moved from here into
	tree-ssa-scopedtables.
	(lookup_avail_expr, build_and_record_new_cond): Likewise.
	(record_conditions, record_cond, vuse_eq): Likewise.
	(record_edge_info): Adjust to API tweak of record_conditions.
	(simplify_stmt_for_jump_threading): Similarly for lookup_avail_expr.
	(record_temporary_equivalences, optimize_stmt): Likewise.
	(eliminate_redundant_computations): Likewise.
	(record_equivalences_from_stmt): Likewise.
	* tree-ssa-scopedtables.c: Include options.h and params.h.
	(vuse_eq): New function, moved from tree-ssa-dom.c
	(build_and_record_new_cond): Likewise.
	(record_conditions): Likewise.  Accept vector of conditions rather
	than edge_equivalence structure for first argument.
	for the first argument.
	(avail_exprs_stack::lookup_avail_expr): New member function, moved
	from tree-ssa-dom.c.
	(avail_exprs_stack::record_cond): Likewise.
	* tree-ssa-scopedtables.h (struct cond_equivalence): Moved here
	from tree-ssa-dom.c.
	(avail_exprs_stack): Add new member functions lookup_avail_expr
	and record_cond.
	(record_conditions): Declare.

From-SVN: r246186