[SCEV] Support all Min/Max SCEVs for GetMinTrailingZeros

There is already support for U/SMax. No reason why Min and SequentialMin
should not be supported.

NFC: code in GetMinTrailingZeroes is copied for a couple node types.
Refactor them into a single code block.

Differential Revision: https://reviews.llvm.org/D141568