[llvm-branch-commits] [llvm] [LoongArch] Add patterns to support vector type average instructions generation (PR #161079)

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zhaoqi5 wrote:

> We could make these `ISD` legal.
> 
> ```shell
>   AVGFLOORS -> avg
>   AVGFLOORU -> avg.u
>   AVGCEILS -> avgr
>   AVGCEILU -> avgr.u
> ```

Thanks for catching this. More tests should be added. So I'd prefer to do that in a separate commit.

https://github.com/llvm/llvm-project/pull/161079