[clang] [CIR] Add rotate operation (PR #148426)

[Erich Keane via cfe-commits]

erichkeane wrote:

> Did this patch undergo a Windows CI build?

Clang-IR changes don't quite yet trigger MLIR/CIR builds yet, just the plain Clang builds, Andy has a patch that has recently received approval from the Infra Area Team to do so, it just needs a few final approvals.

That said, are we sure that this patch actually built those, and these failures aren't a result of something else?

```
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\third-party\benchmark\src\sysinfo.cc(374): error C2065: 'CacheUnknown': undeclared identifier
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\third-party\benchmark\src\sysinfo.cc(374): error C2131: expression did not evaluate to a constant
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\third-party\benchmark\src\sysinfo.cc(374): note: a non-constant (sub-)expression was encountered
C:\buildbot\as-builder-3\llvm-clang-x86_64-win-fast\llvm-project\third-party\benchmark\src\sysinfo.cc(374): error C2051: case expression not constant
```

Seems a little strange to associate with this patch, it doesn't really look like anything on this patch?  

https://github.com/llvm/llvm-project/pull/148426