expmed.c (store_bit_field): Make the SUBREG code adjust bitnum.

expmed.c (store_bit_field): Make the SUBREG code adjust bitnum.

	* expmed.c (store_bit_field): Make the SUBREG code adjust bitnum.
	Set bitpos and offset later in the function.  Do nothing if the
	target is a register and if the bitfield lies completely outside
	that register.
	(extract_bit_field): Make the same SUBREG, bitpos and offset changes
	here.  Return an uninitialised register if the source value is stored
	in a register and the bitfield lies completely outside that register.

From-SVN: r94677