[flang] Use object before converts in fir.dispatch (#68589) In case of small interface mismatches between a function on the caller and callee side, lowering insert converts. These are very often no-ops at runtime (casting a descriptor to a descriptor), but they matter in the strongly type IR. The IR type of an object argument of a fir.dispatch must be the one of the object, not the one of the callee side dummy, which may differ in case of mismatches. Otherwise, the codgeneration of fir.dispatch cannot succeed (it will not access the right binding tables).
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