[flang] Fix characterization of result of function returning procedur… #66248
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…e pointer
The procedure characterization package correctly characterizes the result of a reference to a function that returns a procedure pointer. In the event of a result that is a pointer to a function that itself is a procedure pointer, the code in pointer assignment semantics checking was mistakenly using that result's procedure characteristics as the characteristics of the original function reference. This is just wrong; delete it.