[DeviceAddressSanitizer] Add warning for unaligned __asan_mem_to_shadow call

[yingcong-wu]

And skip some test affected by OpenCL CPU subgroup buffer alignment issue.

This PR addresses #18743.

[yingcong-wu]

Failure looks like infrastructure problem.

[Copilot]

Pull Request Overview

This PR skips certain AddressSanitizer tests on OpenCL CPU devices at -O0 due to subgroup alignment issues, and adds a runtime warning when __asan_mem_to_shadow() is called with an unaligned pointer.

• Introduce %if !cpu guards to skip O0 tests on OpenCL CPU in three SYCL test files.
• Add a static warning message and __spirv_ocl_printf call in __asan_mem_to_shadow for unaligned addresses.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
sycl/test-e2e/AddressSanitizer/out-of-bounds/local/group_local_memory_func.cpp	Skip O0 test run on CPU targets
sycl/test-e2e/AddressSanitizer/out-of-bounds/local/group_local_memory.cpp	Skip O0 test run on CPU targets
sycl/test-e2e/AddressSanitizer/out-of-bounds/buffer/buffer_3d.cpp	Skip O0 test run on CPU targets; added O2 run step
libdevice/sanitizer/asan_rtl.cpp	Added unaligned-address warning in __asan_mem_to_shadow

Comments suppressed due to low confidence (2)

sycl/test-e2e/AddressSanitizer/out-of-bounds/local/group_local_memory_func.cpp:7

• After building the O2 variant, a corresponding // RUN: not %t3.out 2>&1 | FileCheck %s step is missing, so the O2 test case isn’t exercised.

// RUN: %{build} %device_asan_flags -g -O2 -o %t3.out

sycl/test-e2e/AddressSanitizer/out-of-bounds/local/group_local_memory.cpp:7

• The O2 build is added but there’s no // RUN: not %t3.out 2>&1 | FileCheck %s invocation, so test coverage for -O2 is absent.

// RUN: %{build} %device_asan_flags -g -O2 -o %t3.out

[yingcong-wu]

Hi @intel/llvm-gatekeepers , this PR is ready to merge, thanks.