Missing Transpose Optimizations

[avik-pal]

I realized it is better to create sub-issues than open multiple issues:

• transpose(unary(...)) Missing Transpose(Unary(...)) optimizations #213
• transpose(binary(...)) when op is used only in that binary op Missing Transpose of Binary Op optimization #210
• stablehlo.clamp

module {
  func.func @main(%arg0: tensor<2x2xf64>) -> tensor<2x2xf64> {
    %cst = stablehlo.constant dense<1.000000e+00> : tensor<2x2xf64>
    %cst_0 = stablehlo.constant dense<0.000000e+00> : tensor<2x2xf64>
    %0 = stablehlo.transpose %arg0, dims = [1, 0] : (tensor<2x2xf64>) -> tensor<2x2xf64>
    %1 = stablehlo.clamp %cst_0, %0, %cst : tensor<2x2xf64>
    %2 = stablehlo.transpose %1, dims = [1, 0] : (tensor<2x2xf64>) -> tensor<2x2xf64>
    return %2 : tensor<2x2xf64>
  }
}