[DAGCombiner] Add bswap(logic_op(bswap(x), y)) regression test case; NFC

Fold the following case on SelectionDAG combiner
This patch includes the regression test cases

```
bswap(logic_op(x, bswap(y))) -> logic_op(bswap(x), y)
bswap(logic_op(bswap(x), y)) -> logic_op(x, bswap(y))
bswap(logic_op(bswap(x), bswap(y))) -> logic_op(x, y) (with multiuse)
```

Reviewed By: goldstein.w.n

Differential Revision: https://reviews.llvm.org/D149782