Builds upon the work in #10254 to remove identity operations sandwiched
between two non-compute operations (reshape/strided slice - concatenate
is handled differently), under certain conditions. Specifically, an
identity operation is not removed when the dimensionality between the
two non-compute operations is reduced, due to non-congruent values
being accessed incorrectly. For example,
```
strided_slice(dims=4) -> identity -> reshape(dims=4)
```
becomes...
```
strided_slice -> reshape
```
but,
```
strided_slice(dims=4) -> identity -> reshape(dims=2)
```
remains as...
```
strided_slice -> identity -> reshape
```
Change-Id: Ie28ba384fcb3230d6f4651c0c19e2b9526ebcc42
Luke Hutton
2cb769560b