[SYCL] `aligned_alloc_xxx<T>` returns non-null when the alignment argument is not a power of 2

[wangdi4]

Describe the bug
USM allocation functions aligned_alloc templated on allocation type T returns non-null when the alignment argument is not a power of 2 (source ), which conflicts with the SYCL2020 specification 4.8.3 USM allocations: Some of the allocation functions take an explicit alignment parameter. Like std::aligned_alloc, these functions return nullptr if the alignment is not supported by the implementation.

To Reproduce

1. source code
   https://github.com/intel/llvm/blob/e75f21902a944c2776c43082d3f01843426a9525/sycl/test-e2e/USM/align.cpp
   This test checks that aligned_alloc_xxx and aligned_alloc_xxx<T> return nullptr when the alignment argument is not a power of 2

2. Specify the command which should be used to compile the program
   compile: clang++ -fsycl -fsycl-targets=spir64 align.cpp -o align.cpp.tmp.out
   run: env ONEAPI_DEVICE_SELECTOR=opencl:cpu align.cpp.tmp.out

3. Indicate what is wrong and what was expected
   CI SYCL E2E test shows that the non-templated aligned_alloc_xxx cases return nullptr as expected, but the templated aligned_alloc_xxx<T> cases return non-null

Environment (please complete the following information):

• OS: Linux
• Target device and vendor: Intel CPU
• DPC++ version: clang version 18.0.0

Additional context
Add any other context about the problem here.

[HPS-1]

Fixed and merged in PR: #12569