PR tree-optimization/52445

	PR tree-optimization/52445
	* tree-ssa-phiopt.c (struct name_to_bb): Remove ssa_name field,
	add ssa_name_ver, offset and size fields and change store field
	to bool.
	(name_to_bb_hash, name_to_bb_eq): Adjust for the above changes.
	(add_or_mark_expr): Likewise.  Only consider previous stores
	with the same size and offset.
	(nt_init_block): Only look at gimple_assign_single_p stmts,
	doesn't look at rhs2.

	* gcc.dg/pr52445.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@184743 138bc75d-0d04-0410-961f-82ee72b054a4