re PR middle-end/37248 (regression transformation bitfield to individual bytes)

re PR middle-end/37248 (regression transformation bitfield to individual bytes)

	PR middle-end/37248
	* fold-const.c (make_bit_field_ref): Change bitpos and bitsize
	arguments to HOST_WIDE_INT.  If type has different signedness
	than unsignedp or different precision from bitsize, create
	the right type for BIT_FIELD_REF and cast to type.
	(fold_truthop): Change first_bit and end_bit to HOST_WIDE_INT.

	Revert:
	2008-03-05  Richard Guenther  <rguenther@suse.de>
	PR c++/35336
	* fold-const.c (fold_truthop): Remove code generating
	BIT_FIELD_REFs of structure bases.
	(fold_binary): Likewise.
	(make_bit_field_ref): Remove.
	(optimize_bit_field_compare): Remove.
	(all_ones_mask_p): Remove.

	* gcc.target/i386/pr37248-1.c: New test.
	* gcc.target/i386/pr37248-2.c: New test.
	* gcc.target/i386/pr37248-3.c: New test.

From-SVN: r142484