[PATCH] vect: Add bias parameter for partial vectorization

[Robin Dapp]

Hi,

thanks for the helpful comments. The attached v2 addresses the following
points from them:

 - Save the bias in loop_vinfo and set it once in vect_verify_loop_lens.
 - Add code to handle the bias in vect_set_loop_controls_directly.
 - Adjust costing.
 - Add comments for the new len_load parameter as well as change wording.
 - Include the rs6000 change directly.

I'm not entirely satisfied with the bias code for the loop controls,
mainly because of side effects I might not have considered.  The test
suites show no new regressions and bootstrap succeeded, though.

Regards
 Robin
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