Craig Topper bdcd7c0ba0
[DAGCombiner][RISCV] Preserve disjoint flag in folding (shl (or x, c1), c2) -> (or (shl x, c2), c1 << c2) (#76860)
Since we are shifting both inputs to the original Or by the same amount
and inserting zeros in the LSBs, the result should still be disjoint.
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