BFloat16 tests XPASSing in nightly on OCL CPU

[sarnex]

Describe the bug

https://github.com/intel/llvm/actions/runs/9901741273/job/27354870210

 Unexpectedly Passed Tests (3):
  SYCL :: BFloat16/bfloat16_builtins.cpp
  SYCL :: BFloat16/bfloat16_builtins_cuda_generic.cpp
  SYCL :: BFloat16/bfloat16_type.cpp

example:

********************
XPASS: SYCL :: BFloat16/bfloat16_type.cpp (136 of 2099)
******************** TEST 'SYCL :: BFloat16/bfloat16_type.cpp' FAILED ********************
Exit Code: 0

Command Output (stdout):
--
# RUN: at line 1 has no command after substitutions
# RUN: at line 2 has no command after substitutions
# RUN: at line 3
/__w/llvm/llvm/toolchain/bin//clang++   -fsycl -fsycl-targets=spir64  /__w/llvm/llvm/llvm/sycl/test-e2e/BFloat16/bfloat16_type.cpp -o /__w/llvm/llvm/build-e2e/BFloat16/Output/bfloat16_type.cpp.tmp.out
# executed command: /__w/llvm/llvm/toolchain/bin//clang++ -fsycl -fsycl-targets=spir64 /__w/llvm/llvm/llvm/sycl/test-e2e/BFloat16/bfloat16_type.cpp -o /__w/llvm/llvm/build-e2e/BFloat16/Output/bfloat16_type.cpp.tmp.out
# note: command had no output on stdout or stderr
# RUN: at line 4
env ONEAPI_DEVICE_SELECTOR=opencl:cpu  /__w/llvm/llvm/build-e2e/BFloat16/Output/bfloat16_type.cpp.tmp.out
# executed command: env ONEAPI_DEVICE_SELECTOR=opencl:cpu /__w/llvm/llvm/build-e2e/BFloat16/Output/bfloat16_type.cpp.tmp.out
# .---command stdout------------
# | PASS verify_conv_implicit
# | PASS verify_conv_explicit
# | PASS verify_add
# | PASS verify_sub
# | PASS verify_mul
# | PASS verify_div
# | PASS verify_logic
# | PASS verify_add
# | PASS verify_sub
# | PASS verify_minus
# | PASS verify_mul
# | PASS verify_div
# | PASS verify_logic
# `-----------------------------

To reproduce

No response

Environment

No response

Additional context

No response

[sarnex]

@frasercrmck The XFAIL was added in 0f0b699, can you please take a look at why the nightly passes but it failed in whatever case cause you to add XFAIL? Thanks

[frasercrmck]

Ah sorry, it was failing for me locally in a multi-target build with CUDA but perhaps I applied the wrong kind fix. I was applying the suggestion made here perhaps a little too zealously, and took the FIXME comment in the test too literally.

[sarnex]

@frasercrmck Thanks! FYI there are 2 other tests failing, here is the full failing list:

 Unexpectedly Passed Tests (3):
  SYCL :: BFloat16/bfloat16_builtins.cpp
  SYCL :: BFloat16/bfloat16_builtins_cuda_generic.cpp
  SYCL :: BFloat16/bfloat16_type.cpp