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

[Nikita Popov via llvm-commits]

nikic wrote:

@fhahn That's for aligns though. I wouldn't expect doing this for nonnull would cause regressions, as we currently don't use nonnull bundles and already do the opt for `!= null` comparisons.

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