@intel/llvm-gatekeepers please merge.

@callumfare SYCL :: Basic/get_backend.cpp test is failing in post-commit after merging this PR. Could you please take a look?
Details:
https://github.com/intel/llvm/actions/runs/6943189569/job/18888237029

Failed Tests (1):
SYCL :: Basic/get_backend.cpp

2023-11-21T11:51:16.5243903Z FAIL: SYCL :: Basic/get_backend.cpp (191 of 1751)
2023-11-21T11:51:16.5245036Z ******************** TEST 'SYCL :: Basic/get_backend.cpp' FAILED ********************
2023-11-21T11:51:16.5245705Z Exit Code: -6
2023-11-21T11:51:16.5280748Z
2023-11-21T11:51:16.5281189Z Command Output (stdout):
2023-11-21T11:51:16.5281925Z --
2023-11-21T11:51:16.5282275Z # RUN: at line 1
2023-11-21T11:51:16.5284128Z /__w/llvm/llvm/toolchain/bin//clang++ -fsycl -fsycl-targets=spir64 /__w/llvm/llvm/llvm/sycl/test-e2e/Basic/get_backend.cpp -o /__w/llvm/llvm/build-e2e/Basic/Output/get_backend.cpp.tmp.out
2023-11-21T11:51:16.5287393Z # executed command: /__w/llvm/llvm/toolchain/bin//clang++ -fsycl -fsycl-targets=spir64 /__w/llvm/llvm/llvm/sycl/test-e2e/Basic/get_backend.cpp -o /__w/llvm/llvm/build-e2e/Basic/Output/get_backend.cpp.tmp.out
2023-11-21T11:51:16.5289341Z # note: command had no output on stdout or stderr
2023-11-21T11:51:16.5289976Z # RUN: at line 2
2023-11-21T11:51:16.5680409Z /__w/llvm/llvm/build-e2e/Basic/Output/get_backend.cpp.tmp.out
2023-11-21T11:51:16.5681568Z # executed command: /__w/llvm/llvm/build-e2e/Basic/Output/get_backend.cpp.tmp.out
2023-11-21T11:51:16.5682433Z # .---command stderr------------
2023-11-21T11:51:16.5683916Z # | terminate called after throwing an instance of 'sycl::_V1::runtime_error'
2023-11-21T11:51:16.5685771Z # | what(): Native API failed. Native API returns: -999 (Unknown PI error) -999 (Unknown PI error)
2023-11-21T11:51:16.5686858Z # `-----------------------------
2023-11-21T11:51:16.5880114Z # error: command failed with exit status: -6
2023-11-21T11:51:16.5960188Z
2023-11-21T11:51:16.6003733Z --
2023-11-21T11:51:16.6078884Z

@againull @callumfare has just finished for the day, we can look into this tomorrow.

I notice that the failing test is running on Level Zero not OpenCL. The UR changes this PR introduces are limited to only the OpenCL adapter as can be seen here.

I checked back 4 days of SYCL Post Commit runs and it is odd that Basic/get_backend.cpp never showed up as a failure until this PR but the e2e-lin Intel Arc A-Series Graphics with Level Zero workflow has been unstable that whole time.

I've been unable to reproduce this locally although I have an 8th gen iGPU rather than an Arc card. We can try to access another system to debug further tomorrow.

I've not been able to reproduce the failure on an Arc A770, although I did see other E2E tests failing:

Failed Tests (11):
  SYCL :: DeviceLib/imf_fp32_rounding_test.cpp
  SYCL :: DeviceLib/string_test.cpp
  SYCL :: ESIMD/preemption.cpp
  SYCL :: KernelCompiler/kernel_compiler.cpp
  SYCL :: KernelCompiler/opencl_capabilities.cpp
  SYCL :: Plugin/level_zero_usm_residency.cpp
  SYCL :: Tracing/usm/queue_copy_released_pointer.cpp
  SYCL :: Tracing/usm/queue_single_task_nullptr.cpp
  SYCL :: Tracing/usm/queue_single_task_released_pointer.cpp
  SYCL :: USM/usm_leak_check.cpp
  SYCL :: XPTI/mem_alloc_events_linux.cpp

I suspect those might be related to the driver version.