SYCL/SubGroup/shuffle_fp64.cpp test in intel/llvm-test-suite fails for CUDA backend

[steffenlarsen]

The SYCL/SubGroup/shuffle_fp64.cpp test in intel/llvm-test-suite fails after intel/llvm-test-suite#1618 for the CUDA backend with errors like

  .../include/sycl/detail/spirv.hpp:680:17: error: SYCL kernel cannot call an undefined function without SYCL_EXTERNAL attribute
      result[s] = SubgroupShuffleDown(x[s], delta);
                  ^
  .../include/sycl/detail/spirv.hpp:611:27: note: 'SubgroupShuffleDown<double>' declared here
  EnableIfGenericShuffle<T> SubgroupShuffleDown(T x, id<1> local_id);
                            ^
  .../include/sycl/detail/spirv.hpp:677:26: note: called by 'SubgroupShuffleDown<sycl::vec<double, 16>>'
  EnableIfVectorShuffle<T> SubgroupShuffleDown(T x, uint32_t delta) {

See logs on #8425 for more information.

[GeorgeWeb]

Hey @steffenlarsen 👋

#8614 fixes this.

georgi@devpc:~/workspaces/forks/llvm-test-suite/build$ /usr/bin/python3.10 \
/home/georgi/workspaces/dpcpp/llvm/build/./bin/llvm-lit \
-sv --param sycl_be=cuda --param target_devices=gpu \
~/workspaces/forks/llvm-test-suite/build/SYCL/SubGroup/shuffle_fp64.cpp
llvm-lit: /home/georgi/workspaces/forks/llvm-test-suite/SYCL/lit.cfg.py:235: note: Backend: ext_oneapi_cuda

Testing Time: 2.75s
  Passed: 1

2 warning(s) in tests

Will open a PR for re-enabling the test, once the fix gets merged.