[Patch, fortran] [01..06/66] inline sum and product: Prepare gfc_trans_preloop_setup

[Mikael Morin]

This is a 6 steps program to update gfc_trans_preloop_setup.
gfc_trans_preloop_setup appeared completely rewritten. These step by step
patches show that it is not the case.
Combined patch attached here.
OK?
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