[llvm] [DAG] SDPatternMatch m_Zero/m_One/m_AllOnes have inconsistent undef h… (PR #147044)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

Sorry for the confusion - I meant that I asked you in the review to remove it from #147044 but then create a separate PR for it as a followup

https://github.com/llvm/llvm-project/pull/147044