[llvm] [mlir][spirv] Add mlir-spirv-tests CI to run for mlir-spv target tests (PR #152124)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> I believe it's "CI Checks" (https://github.com/llvm/llvm-project/actions/workflows/premerge.yaml), script: https://github.com/llvm/llvm-project/blob/main/.github/workflows/premerge.yaml

Those checks run on powerful self hosted runners (64 threads) and have good build caching. This workflow runs on the free four core Github runners and Github build caching is generally pretty poor. It is going to be a lot slower.

> I have also noticed that auto-merge doesn't wait for this job: https://github.com/llvm/llvm-project/pull/153440 We also should address that if deemed necessary. Not sure if this PR is the best place to track those issues.

Enabling auto-merge requires making the check required. Required checks cannot have path dependencies. I also doubt the community is interested in making this check required.

https://github.com/llvm/llvm-project/pull/152124