Function execute_elementwise_op 

pub fn execute_elementwise_op<A: CubePrimitive, S: MatrixScope>(
    matrix_in: &Matrix<A, S>,
    matrix_out: &Matrix<A, S>,
    op: impl Fn(u32, u32, A::Scalar) -> A::Scalar,
)

Execute an elementwise op on the matrix fragment.

Function parameters are (row, col, element) -> element