powerpc: micro-optimize cpu_switch()

powerpc: micro-optimize cpu_switch()

Since the non-volatile registers are restored at the end of cpu_switchin (of
the new thread) they're free for us to use for our own purposes.  Load the
PCB_FLAGS into a non-volatile register so it's preserved across the C
function calls that manage FPU and altivec state.  This removes 4 loads from
each file.  Might be a trivial performance improvement (~12 clock cycles per
context switch).

MFC after:	3 weeks