(set_nonzero_bits_and_sign_copies): Handle reg even if only set once and in one basic...

(set_nonzero_bits_and_sign_copies): Handle reg even if only set once and in one basic block.

(set_nonzero_bits_and_sign_copies): Handle reg even
if only set once and in one basic block.
(nonzero_bits, case REG): Use REGNO_POINTER_ALIGN instead of
explicit alignment of registers pointing into frame.

From-SVN: r10870