[llvm] [AMDGPU] Defaults for missing dimensions in SYCL required wg size (PR #68872)

[Jakub Chlanda via llvm-commits]

jchlanda wrote:

@arsenm we're quite keen on this being resolved, I've had another go at it only modifying the internal handling of the verifier here: https://github.com/llvm/llvm-project/pull/72652 (following you comment re changing metadata). https://github.com/llvm/llvm-project/pull/72652 achieves the same thing and if accepted could supersed this PR.

https://github.com/llvm/llvm-project/pull/68872