Add unit tests for pcmp_le, pcmp_lt and pcmp_lt_or_nan

Describe the feature you would like to be implemented.

Title says it all: unit tests for pcmp_le, pcmp_lt and pcmp_lt_or_nan as currently only pcmp_eq is tested.

Would such a feature be useful for other users? Why?

It would be useful for folks adding new arch backend but also to increase code coverage.

Any hints on how to implement the requested feature?

I volunteer to add them. Just want to get approval for it first.

Additional resources