DmdAnal: Fix maxDmdType

Zubinrequested to merge
wip/27626 into master

DmdAnal: Fix maxDmdType

We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType.

Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType uniformly.

fixes #27626 (closed)

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