[SYCL][CUDA][libclc] Fix out-of-bound behavior for none addressing mode.

[pgorlani]

This fix makes the addressing_mode::none behavior in CUDA devices consistent with the host one avoiding CUDA_ERROR_ILLEGAL_ADDRESS errors in case of out-of-bound accesses.

[bader]

Is it covered by existing tests?
If not, please, add a regression test.

[pgorlani]

There are tests for image samplers in https://github.com/intel/llvm-test-suite/blob/intel/SYCL/Basic/image/image_accessor_readsampler.cpp, but they are not supported by the CUDA backend, due to the fact that many features regarding image channel datatypes/value conversions are missing. Unfortunately, the image support in the CUDA backend is very limited. The only tests supported in https://github.com/intel/llvm-test-suite/blob/intel/SYCL/Basic/image/ by the CUDA backend are in image.cpp, image_read.cpp, image_read_fp16.cpp and image_write_fp16.cpp, but they do not deal with samplers.

[bader]

There are tests for image samplers in https://github.com/intel/llvm-test-suite/blob/intel/SYCL/Basic/image/image_accessor_readsampler.cpp, but they are not supported by the CUDA backend, due to the fact that many features regarding image channel datatypes/value conversions are missing. Unfortunately, the image support in the CUDA backend is very limited. The only tests supported in https://github.com/intel/llvm-test-suite/blob/intel/SYCL/Basic/image/ by the CUDA backend are in image.cpp, image_read.cpp, image_read_fp16.cpp and image_write_fp16.cpp, but they do not deal with samplers.

Okay, it sounds like we can use a separate test for this fix.