expmed.c (store_bit_field): Assert that BITREGION_START is a multiple of a unit before computing the offset...

	* expmed.c (store_bit_field): Assert that BITREGION_START is a multiple
	of a unit before computing the offset in units.
	* expr.c (get_bit_range): Return the null range if the enclosing record
	is part of a larger bit field.

From-SVN: r185857