RealSchur: Make sure zeros are really zero; simplify initFrancisQRStep().
RealSchur: Make sure zeros are really zero; simplify initFrancisQRStep().

ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,TSC21/Eigen,TSC21/Eigen,pasuka/eigen,ritsu1228/eigen,toastedcrumpets/eigen,pasuka/eigen,Zefz/eigen,Zefz/eigen,ritsu1228/eigen,TSC21/Eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen,pasuka/eigen,toastedcrumpets/eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,pasuka/eigen,toastedcrumpets/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,pasuka/eigen