[llvm] [DAG] Add funnel-shift matchers to SDPatternMatch (Fixes #185880) (PR #186593)

[Min-Yih Hsu via llvm-commits]

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mshockwave wrote:

could we simplify write `return matchShiftOr(Ctx, N, N.getValueType().getScalarSizeInBits());` here? `matchShiftOr` is gonna return false for non-`ISD::OR` nodes anyway.

https://github.com/llvm/llvm-project/pull/186593