ARM: Avoid fast path for BITOP.
ARM: Avoid fast path for BITOP.

GCC will produce certain unaligned multi load-store instructions
that will be trapped by the Linux kernel since ARM v6 cannot
handle them with unaligned addresses. Better to use the slower
but safer implementation instead of generating the exception which
should be anyway very slow.

JRHZRD/swapdb,JRHZRD/swapdb,JRHZRD/swapdb,JRHZRD/swapdb,JRHZRD/swapdb,JRHZRD/swapdb,JRHZRD/swapdb,JRHZRD/swapdb