* tree-nested.c (build_addr): Merge real/imagpart with
	handled_component_p.
	(convert_nonlocal_reference, convert_local_reference): Process extra
	args to COMPONENT_REF and ARRAY_REF.
	* tree-outof-ssa.c (discover_nonconstant_array_refs_r): Check for
	lower bound and field offset being constant.

From-SVN: r83677