rtlanal.c (lsb_bitfield_op_p): New predicate for bitfield operations from the least...

rtlanal.c (lsb_bitfield_op_p): New predicate for bitfield operations from the least significant bit.

2013-09-25  Yvan Roux  <yvan.roux@linaro.org>
	    Vladimir Makarov  <vmakarov@redhat.com>

	* rtlanal.c (lsb_bitfield_op_p): New predicate for bitfield operations
	from the least significant bit.
	(strip_address_mutations): Add bitfield operations handling.
	(must_be_index_p): Add shifting and rotate operations handling.
	(set_address_base): Use must_be_base_p predicate.
	(set_address_index):Use must_be_index_p predicate.

Co-Authored-By: Vladimir Makarov <vmakarov@redhat.com>
From-SVN: r202914