* tree.c (bitfield_p): New.
	* cp-tree.h: Declare it.
	* typeck.c (cxx_sizeof_expr, cxx_alignof_expr)
	(cp_build_addr_expr_1): Use it instead of DECL_C_BIT_FIELD.
	* decl.c (cp_finish_decomp): Look through reference.  Always
	SET_DECL_DECOMPOSITION_P.
	* semantics.c (finish_decltype_type): Adjust decomposition handling.

From-SVN: r242408