[Patch, fortran] [4/5] PR 45648: Inline transpose part 2: Remove ss lookup

[Mikael Morin <mikael dot morin at sfr dot fr>]

This one is optional. 
I noticed while working on these patches that there were loops to get the ss corresponding to the expr to be evaluated. This is a contradiction with other places in the code where se->ss is supposed to be in sync (this is the point of gfc_advance_se_ss_chain) with the expression to be calculated (grep "ss->expr == expr"). Furthermore, the first half of the function was using secss (with lookup) and the second ss (without).
Thus, this removes the ss lookup and replaces the asserts with their equivalent without lookup. There is no behavioural change and this is not directly related to the patchset, so this is optional. 

OK for trunk?

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