[clang] [llvm] [IR] Allow integer vector atomicrmw (PR #190716)

[Fabian Ritter via cfe-commits]

ritter-x2a wrote:

FYI, the [developer policy](https://llvm.org/docs/DeveloperPolicy.html#commit-messages) says:
> Avoid ‘tagging’ someone’s username in your commits and PR descriptions (e.g., `@<someUser>`), doing so results in that account receiving a notification every time the commit is cherry-picked and/or pushed to a fork.

Currently, `@arsenm` is tagged in the description for this PR. Github might have fixed that issue by now, though.

https://github.com/llvm/llvm-project/pull/190716