[clang] [CIR] Implement device-wide nounwind attribute (PR #227016)

[Mariya Podchishchaeva via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcuda-is-device -fclangir -emit-cir %s -o - \
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Fznamznon wrote:

Is there any point in checking x86_64 target for device?

https://github.com/llvm/llvm-project/pull/227016