[llvm] [SPIRV] Emit intrinsics for globals only in function that references them (PR #178143)

[Konrad Kleine via llvm-commits]

https://github.com/kwk commented:

Thank you for working on this!!! To me this change in `shouldEmitIntrinsicsForGlobalValue` looks reasonable. But I feel like I cannot judge the tests and nor the entire handling in context. That's why I wait for someone else to approve this change. But with your detailed description in the PR's initial comment and the source code comments, this looks good. 

https://github.com/llvm/llvm-project/pull/178143