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The latest changes: 1. Defined a new IR `VectorBitwiseBlendNode` 2. Do the optimization in IGVN: // XorV(a, AndV(sel, XorV(a, b))) => VectorBitwiseBlend(a, b, sel) // XorV(a, AndV(sel, XorV(a, b)), mask) => // VectorBlend(a, VectorBitwiseBlend(a, b, sel), mask) 3. Adjust the ad file match rules to match `VectorBitwiseBlendNode`. 4. Adjust the JTReg tests to check `VectorBitwiseBlendNode`.
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