expand-fp: Refactor modification status handling (NFC) (#163542)

Modify the return value of the runImpl function which indicates whether or not the IR has been changed in a
single place instead of doing it separately for each instruction at the insertion into the worklist.

Further changes: Replace if-else in worklist processing loop by switch and add test cases which demonstrate that the "scalarize" function does not always add items to the worklist and hence a worklist emptiness check cannot be used for the runImpl return value.

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