re PR tree-optimization/51315 (unaligned memory accesses generated with -ftree-sra)

re PR tree-optimization/51315 (unaligned memory accesses generated with -ftree-sra)

	PR tree-optimization/51315
	* tree.h (get_object_or_type_alignment): Declare.
	* expr.c (get_object_or_type_alignment): Move to...
	* builtins.c (get_object_or_type_alignment): ...here.  Add assertion.
	* tree-sra.c (tree_non_mode_aligned_mem_p): Rename to...
	(tree_non_aligned_mem_p): ...this.  Add ALIGN parameter.  Look into
	MEM_REFs and use get_object_or_type_alignment for them.
	(build_accesses_from_assign): Adjust for above change.
	(access_precludes_ipa_sra_p): Likewise.

From-SVN: r182102