[SYCL][E2E] Ensure lowering of llvm.bitreverse for 2/4-bit scalars is functionally correct

[LU-JOHN]

Ensure that lowering of llvm.bitreverse.i2/i4 by llvm-spirv is functionally correct.

[againull]

@LU-JOHN Introduced test fails in pre-commit:

2024-05-10T17:40:26.8989941Z env ONEAPI_DEVICE_SELECTOR=level_zero:gpu  /__w/llvm/llvm/build-e2e/LLVMIntrinsicLowering/Output/bitreverse.cpp.tmp.out
2024-05-10T17:40:26.8990827Z # executed command: env ONEAPI_DEVICE_SELECTOR=level_zero:gpu /__w/llvm/llvm/build-e2e/LLVMIntrinsicLowering/Output/bitreverse.cpp.tmp.out
2024-05-10T17:40:26.8991396Z # .---command stderr------------
2024-05-10T17:40:26.8991920Z # | terminate called after throwing an instance of 'sycl::_V1::compile_program_error'
2024-05-10T17:40:26.8992343Z # |   what():  The program was built for 1 devices
2024-05-10T17:40:26.8992718Z # | Build program log for 'Intel(R) Iris(R) Xe Graphics':
2024-05-10T17:40:26.8993054Z # |  -11 (PI_ERROR_BUILD_PROGRAM_FAILURE)
2024-05-10T17:40:26.8993319Z # `-----------------------------
2024-05-10T17:40:26.8993583Z # error: command failed with exit status: -6

[againull]

Is this test passing on other GPUs (like pvc, dg2)?

[LU-JOHN]

On commit 1ad567a3f7f47920549bb58d6b433b7af869c7dd, it was only failing on:

SYCL Pre Commit on Windows / e2e / Intel GEN12 Graphics with Level Zero
SYCL Pre Commit on Linux / test (Intel, ["Linux", "gen12"], ghcr.io/intel/llvm/ubuntu2204_intel_drivers

Everything is passing now with the latest commit d7b722ec0d1eaa22dbfaceb17d1525f4418738f5.

[againull]

We test only on Gen12 in pre-commit testing, so because you marked the test with XFAIL: gpu-intel-gen12, it passes now on Gen12. Unfortunately, it doesn't mean that test passes on other hardware. So it may easily fail on DG2 testing in post-commit.

[againull]

Also, does it make sense to land this PR since IGC has some issues with these instructions?
Basically, because of this you disable testing of all other builtins (for other types).

Maybe it worth outlining this builtings to a separate test? And maybe even check only llvm-spirv translation for now (not e2e)?

[LU-JOHN]

Test has a segmentation fault on pvc machine and dg2 machine.

[LU-JOHN]

2/4-bit bitreverse testing moved to new file.

[againull]

Marking as requested changes for now to avoid accidental merge, just because some issues need to be addressed first.

[steffenlarsen]

Post-commit failure should be addressed by #13889.