nv50/ir: remove unused private field cycle to SchedDataCalculator

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp

@@ -2712,7 +2712,6 @@ private:
 
    RegScores *score; // for current BB
    std::vector<RegScores> scoreBoards;
-   int cycle;
    int prevData;
    operation prevOp;