[llvm] github: Add libclc to PR autolabeler (PR #149274)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> Why is the group relevant? It only applies a label

Normally the labelling is used to trigger another script that then adds a comment pinging the PR subscribers group associated with that label which I thought was what you wanted here.

If you just want the label, I think this should be fine.

https://github.com/llvm/llvm-project/pull/149274