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

[Sameer Sahasrabuddhe via llvm-commits]

ssahasra wrote:

> Do you have a test case? I'd like to see how this effects the generation of the merge instructions. Thanks.

The way I see it, the request should be turned around. Is there an existing test case that even reaches here? This code is clearly wrong and cannot possibly do anything. Any test for it will be rejected by the verifier.

https://llvm.org/docs/ConvergentOperations.html#llvm-experimental-convergence-anchor

> It is an error to pass a convergencectrl operand bundle at a call to this intrinsic.

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