[InstCombine] try to fold rem with constant dividend and select-of-constants divisor

We avoid this fold in the more general cases where we use `FoldOpIntoSelect`.
That's because -- unlike most binary opcodes -- 'rem' can't usually be
speculated with a variable divisor since it can have immediate UB. But in
the case where both arms of the select are constants, we can safely evaluate
both sides and eliminate 'rem' completely.

This should fix:
https://llvm.org/PR52102

The same optimization for 'div' is planned as a follow-up patch.

Differential Revision: https://reviews.llvm.org/D115173