Multidimensional array with dimension size 1 is not eliminated

[chhzh123]

In this example, the 0th dimension of A is useless, since it only has size 1.

def test_multidimensional_array():
    hcl.init()
    A = hcl.placeholder((1, 100), "A")
    def kernel(A):
        B = hcl.compute(A.shape, lambda x, y: A[x, y] + 1, "B")
        return B
    s = hcl.create_schedule([A], kernel)
    target = hcl.platform.zc706
    target.config(compile="vivado_hls",mode="csim")
    f = hcl.build(s, target=target)
    hcl_A = hcl.asarray(np.zeros((1,100)))
    hcl_B = hcl.asarray(np.zeros((1,100)))
    f(hcl_A,hcl_B)

The generated code outputs a constant as a placeholder. However, A and B can be both optimized to 1D arrays.

void test(bit32 B[1][100], bit32 A[1][100]) {
    B_y: for (bit32 y = 0; y < 100; ++y) {
      B[0][y] = (A[0][y] + 1);
    }
  }