[clang] [CIR] Upstream CUDA mangling test with LLVM and OGCG verification (PR #184444)

[Srivarshitha M via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -x cuda -emit-cir -target-sdk-version=12.3 %s -o %t.cir
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16srivarshitha wrote:

I've removed the duplicate file at clang/test/CIR/CodeGen/CUDA/mangling.cu. The test now lives only in clang/test/CodeGenCUDA/ as requested.

https://github.com/llvm/llvm-project/pull/184444