[POWERPC] spufs: rework class 0 and 1 interrupt handling

Based on original patches from
 Arnd Bergmann <[email protected]>; and
 Luke Browning <[email protected]>

Currently, spu contexts need to be loaded to the SPU in order to take
class 0 and class 1 exceptions.

This change makes the actual interrupt-handlers much simpler (ie,
set the exception information in the context save area), and defers the
handling code to the spufs_handle_class[01] functions, called from
spufs_run_spu.

This should improve the concurrency of the spu scheduling leading to
greater SPU utilization when SPUs are overcommited.

Signed-off-by: Jeremy Kerr <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>

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