[llvm] [AMDGPU] Enhance error handling for mismatched calling conventions (PR #137825)

[Manuel Carrasco via llvm-commits]

mgcarrasco wrote:

> Undefined behavior is not a compiler error. This should handle the call directly, probably by just emitting no code

Thanks for the clarification on compiler error and UB. I will close the PR for now and submit the UB fixes for existing test cases separately.

https://github.com/llvm/llvm-project/pull/137825