[llvm] [SPIRV] convergence anchor intrinsic does not have a parent token (PR #122230)

[Steven Perron via llvm-commits]

https://github.com/s-perron approved this pull request.

We look into what to do if there is an anchor in the llvm-ir. This is fine for now.

https://github.com/llvm/llvm-project/pull/122230