af5c471a4d
This PR adds a folder for extracting an element from a vector shuffle.
It turns something like:
```
%shuffle = vector.shuffle %a, %b [0, 8, 7, 15]
: vector<8xf32>, vector<8xf32>
%extract = vector.extract %shuffle[3] : f32 from vector<4xf32>
```
into:
```
%extract = vector.extract %b[7] : f32 from vector<8xf32>
```
Multi-Level Intermediate Representation
See https://mlir.llvm.org/ for more information.