gdb/

	gdb/
	* valops.c (value_fetch_lazy): Handle bitfields explicitly.
	(value_assign): Remove unnecessary FIXME.  Honor the container
	type of bitfields if possible.
	* value.c (struct value): Add parent field.
	(value_parent): New function.
	(value_free): Free the parent also.
	(value_copy): Copy the parent also.
	(value_primitive_field): Do not read the contents of a lazy
	value to create a child bitfield value.  Set bitpos and offset
	according to the container type if possible.
	(unpack_bits_as_long): Rename from unpack_field_as_long.  Take
	field_type, bitpos, and bitsize instead of type and fieldno.
	(unpack_field_as_long): Use unpack_bits_as_long.
	* value.h (value_parent, unpack_bits_as_long): New prototypes.