In cases where there is no padding on a dim, we do not need to compute
new offsets, lengths and padding, for example the new test case added
can just be lowered to
```
%extracted_slice = tensor.extract_slice %arg0[%arg2, 1, 2] [%arg2, 2, 1] [1, 1, 1] : tensor<3x4x5xf32> to tensor<?x2x1xf32>
```
without this PR we will have affine maps like
```
#map = affine_map<()[s0] -> (3, s0)>
#map1 = affine_map<()[s0, s1] -> (-s0 + 3, s1)>
%0 = affine.min #map()[%arg2]
%1 = affine.min #map1()[%0, %arg2]
%extracted_slice = tensor.extract_slice %arg0[%0, 1, 2] [%1, 2, 1] [1, 1, 1] : tensor<3x4x5xf32> to tensor<?x2x1xf32>
```
which are unnecessary
Signed-off-by: Nirvedh <nirvedh@gmail.com>
23020a8d01