Revert more changes that landed on top of 741978d727

This should've been in 7ad666798f12456d9 but wasn't.

Squashes these twoc commits:
Revert "[clang][cli] Let denormalizer decide how to render the option based on the option class"
This reverts commit 70410a264949101ced3ce3458f37dd4cc2f5af85.

Revert "[clang][cli] Implement getAllArgValues marshalling"
This reverts commit 63a24816f561a5d8e28ca7054892bd8602618be4.