[flang][runtime] Accommodate change of type in assignment to allocatable (#141988) When an assignment to a derived type allocatable requires (re)allocation, its type may change to that of the right-hand side. The code didn't update its derived type pointer, leading to the wrong type being put into the descriptors created for elemental defined assignment subroutine calls. Fixes https://github.com/llvm/llvm-project/issues/141835.
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