[AArch64][GlobalISel] Fold G_XOR x, -1 into G_SELECT and select CSINV

When we see

```
xor = G_XOR xor_lhs, -1
select = G_SELECT cc, tval, xor
```

Fold this into

```
select = CSINV tval, xor_lhs, cc
```

Update select-select.mir to reflect the changes.

For now, only handle the case where the G_XOR is the false-value for the
G_SELECT. It may make more sense to handle the true-value case in post-legalizer
lowering.

Differential Revision: https://reviews.llvm.org/D90774

0 files changed, 0 insertions, 0 deletions