* tree.h (maybe_fold_offset_to_component_ref): Remove.
	(maybe_fold_offset_to_reference): Declare.
	* fold-const.c (fold_unary): Do not fold
	(type *)&A into &A->field_of_type_and_offset_0
	* tree-ssa-ccp.c (maybe_fold_offset_to_array_ref): When base type
	size is unknown, give up.
	(maybe_fold_offset_to_component_ref): Ignore firelds with unknown
	offsets.
	(maybe_fold_offset_to_reference): New.
	(maybe_fold_stmt_indirect): Use it.
	(fold_stmt_r): Fold (type *)&A+offset into A->field_if_type_and_offset.
	* gimplify.c (gimplify_conversion): Canonicalize conversions to
	field references.
	(gimplify_expr): Likewise for plus_expr.

From-SVN: r124323