[clang] [Clang][CUDA] Replace inline asm in __trap() with intrinsic (PR #166152)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Weibo He (NewSigma)

<details>
<summary>Changes</summary>

This patch proposes replacing the inline assembly with an intrinsic and adds the `noreturn` to avoid warnings when the caller is also `noreturn`.

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Full diff: https://github.com/llvm/llvm-project/pull/166152.diff


1 Files Affected:

- (modified) clang/lib/Headers/__clang_cuda_device_functions.h (+1-1) 


``````````diff
diff --git a/clang/lib/Headers/__clang_cuda_device_functions.h b/clang/lib/Headers/__clang_cuda_device_functions.h
index 86123727a1bc3..0226fe95abab6 100644
--- a/clang/lib/Headers/__clang_cuda_device_functions.h
+++ b/clang/lib/Headers/__clang_cuda_device_functions.h
@@ -528,7 +528,7 @@ __DEVICE__ float __tanf(float __a) { return __nv_fast_tanf(__a); }
 __DEVICE__ void __threadfence(void) { __nvvm_membar_gl(); }
 __DEVICE__ void __threadfence_block(void) { __nvvm_membar_cta(); };
 __DEVICE__ void __threadfence_system(void) { __nvvm_membar_sys(); };
-__DEVICE__ void __trap(void) { __asm__ __volatile__("trap;"); }
+__DEVICE__ __attribute__((noreturn)) void __trap(void) { __builtin_trap(); }
 __DEVICE__ unsigned short
 __usAtomicCAS(unsigned short *__p, unsigned short __cmp, unsigned short __v) {
   return __nvvm_atom_cas_gen_us(__p, __cmp, __v);

``````````

</details>


https://github.com/llvm/llvm-project/pull/166152