[csl-arm-branch]: Better bypasses for 1026 and 1136 processors

[Nathan Sidwell]

Richard,
this patch implements the alu, alu_shift and alu_shift_reg instruction type
attributes we discussed. All seems to be good with this. I also realized
I'd not tested the previous patch properly, which I have done with this
one, hence the robustifying on the scheduler predicates.

built and tested with an arm-unknown-linux cross compiler.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
          The voices in my head said this was stupid too
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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