[llvm] [PatternMatch] Do not accept undef elements in m_AllOnes() and friends (PR #88217)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw approved this pull request.

LGTM. BTW, can we drop the call to `Constant::replaceUndefsWith` in InstCombine after this patch lands?
See also https://github.com/llvm/llvm-project/pull/85772/files#r1530496643.

https://github.com/llvm/llvm-project/pull/88217