[llvm] [GlobalISel] Add boolean predicated legalization action methods. (PR #111287)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

Store common legality queries at the top of the file:

```
auto HasSVEAndTypes = [=](const LegalityQuery &Query) {
   return HasSVE && typeSetIn(0, {nxv16s8, nxv8s16, nxv4s32, nxv2s64});
},
```

used them in `legalIf`

```
.legalIf(HasSVEAndType)
```

https://github.com/llvm/llvm-project/pull/111287