[ValueTracking] Do more thorough non-zero check in `isKnownToBePowerOfTwo` when `OrZero` is no set.

We can cover more cases by directly checking if the result is
known-nonzero for common patterns when they are missing `OrZero`.

This patch add `isKnownNonZero` checks for `shl`, `lshr`, `and`, and `mul`.

Differential Revision: https://reviews.llvm.org/D157309