[PATCH,rs6000] fix interrupt safety issue on E500 targets

[David Edelsohn]

	* config/rs6000/rs6000.c (rs6000_emit_epilogue): Correct
	altivec sp_offset.  Rearrange sp_offset assignments to
	correspond to stack adjustments.  Use frame_reg_rtx for
	SPE register restores.  Correct SPE stack adjustment.


Okay.

Thanks, David