[Flang][OpenMP] Fix OpenMP static scheduling when trip count is zero (#170863) Code-gen produced incorrect code for cases when the trip count an associated DO loop was zero. The generated code evaluated the trip count of the loop and substracted 1 from it. When this was passed to __kmpc_for_static_init_4u, the value was interpreted as unsigned, which made the upper bound of the worksharing loop 2^32-1 and caused a division by zero in the calculation of the loop bounds for the threads.
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