[llvm] [InstCombine] Always fold nonnull assumptions into operand bundles (PR #169923)

[Nikita Popov via llvm-commits]

nikic wrote:

It looks like we're currently also missing support for optimizing redundant nonnull assumptions. Should at least drop these based on isKnownNonZero in InstCombine.

https://github.com/llvm/llvm-project/pull/169923