[llvm] [AMDGPU] Print `workgroup_processor_mode` metadata field as a boolean (PR #135627)

[Shilei Tian via llvm-commits]

https://github.com/shiltian commented:

LGTM, though I'm not sure what kind of difference it can make. Can you request a full testing cycle internally to test whether the runtime can fully support it?

https://github.com/llvm/llvm-project/pull/135627