Revert "[SLP]Fix a crash if the argument of call was affected by minbitwidth analysis."

After reconsidering the words of @nikic, I have decided to revisit the patches I suggested be backported. Upon further analysis, I think there is a high likelihood that this change added to release 18.x was referencing a crash that was caused by a PR that isn't added.

I will, however, keep the test that was added just in case.

This reverts commit 6e071cf3.