AMDGPU: Add test showing bit operations that should be reducible (#141837) v_xor_i64_known_i32_from_range_use_out_of_block demonstrates a regression that appears in a future patch in the IR division expansion. We could generalize splitBinaryBitConstantOp to use known bits. I'm not sure if it's worth it in the original example, since the pattern seems to disappear if I optimize the division expansion. We should probably fix the divide expand to avoid this.
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