[clang] [CUDA/HIP] Do not check function calls in discarded statement (PR #194606)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin commented:

This change needs a release note.
Please add an entry to `clang/docs/ReleaseNotes.rst` in the section the most adapted to the change, and referencing any Github issue this change fixes. Thanks!

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LGTM otherwise

https://github.com/llvm/llvm-project/pull/194606