[committed] Add missing update_stmt in transform_to_exit_first_loop_alt

[Tom de Vries]

Hi,

I realized that transform_to_exit_first_loop_alt is missing an 
update_stmt for the gimple_cond_set_rhs (transform_to_exit_first_loop 
has an update_stmt after a similar gimple_cond_set_lhs).

Bootstrapped and reg-tested on x86_64.

Committed as trivial.

Thanks,
- Tom
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