[llvm] [DAG] SDPatternMatch - allow m_BinOp / m_c_BinOp to take an optional SDNodeFlags required for matching (PR #178435)

[Min-Yih Hsu via llvm-commits]

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

LGTM

https://github.com/llvm/llvm-project/pull/178435