Changes since v1:

- Instead of passing max_insns to tb_start, merge max_insns into base,
  as suggested by Richard.
  Note that I'm using an int, which is what all the callers were using
  and is what the "bound" variables use too.

- Added rth's R-b tag to patch 2

I left out the suggestion of handling the gusa sequence in
translate_insn; I'm not very familiar with this code and don't have
a superh user-mode workload to test on.

Thanks,

		Emilio