[PATCH] Insert new bound in try_transform_to_exit_first_loop_alt

[Tom de Vries]

Hi,

this patch allows try_transform_to_exit_first_loop_alt to handle the 
case that the new loop bound nit + 1 is not available as ssa-name n in 
the assignment nit = n - 1, by inserting the new loop bound.

Bootstrapped and reg-tested on x86_64.

OK for trunk?

Thanks,
- Tom
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