[clang] [llvm] [clang] Simplify device kernel attributes (PR #137882)

[Nick Sarnie via cfe-commits]

================
@@ -227,7 +227,7 @@ void SPIRVTargetCodeGenInfo::setCUDAKernelCallingConvention(
   // Convert HIP kernels to SPIR-V kernels.
   if (getABIInfo().getContext().getLangOpts().HIP) {
     FT = getABIInfo().getContext().adjustFunctionType(
-        FT, FT->getExtInfo().withCallingConv(CC_OpenCLKernel));
+        FT, FT->getExtInfo().withCallingConv(CC_DeviceKernel));
----------------
sarnex wrote:

Seems we still do need it, removing it results in these failures

```
Failed Tests (20):
  Clang :: CodeGenCUDA/amdgpu-atomic-ops.cu
  Clang :: CodeGenCUDA/amdgpu-kernel-arg-pointer-type.cu
  Clang :: CodeGenCUDA/amdgpu-kernel-attrs.cu
  Clang :: CodeGenCUDA/amdgpu-visibility.cu
  Clang :: CodeGenCUDA/builtins-amdgcn.cu
  Clang :: CodeGenCUDA/builtins-spirv-amdgcn.cu
  Clang :: CodeGenCUDA/host-used-device-var.cu
  Clang :: CodeGenCUDA/kernel-amdgcn.cu
  Clang :: CodeGenCUDA/kernel-arg-name-metadata.cu
  Clang :: CodeGenCUDA/kernel-args.cu
  Clang :: CodeGenCUDA/lambda-constexpr-capture.cu
  Clang :: CodeGenCUDA/lambda.cu
  Clang :: CodeGenCUDA/record-layout.cu
  Clang :: CodeGenCUDA/struct-mangling-number.cu
  Clang :: CodeGenCUDA/unnamed-types.cu
  Clang :: CodeGenCUDA/unused-global-var.cu
  Clang :: CodeGenHIP/hip-cumode.hip
  Clang :: CodeGenHIP/maybe_undef-attr-verify.hip
  Clang :: Headers/hip-header.hip
  Clang :: Misc/backend-resource-limit-diagnostics.hip
```

https://github.com/llvm/llvm-project/pull/137882
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