test_kernel_attributes test is not correct

OpenCL spec (https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_API.html#CL_KERNEL_ATTRIBUTES): For kernels not created from OpenCL C source and the clCreateProgramWithSource API call the string returned from this query will be empty.

But in test_kernel_attributes test, it read from bc binary and expect to get kernel attribute, which is not consistent with OpenCL spec. Related test code:
static bool
test_kernel_attributes(cl_device_id device, cl_uint width, const char *folder)
{
...
get_bc_file_path(folder, "kernel_attributes", bc_file_path, width);
clProgramWrapper bcprog = create_program_from_bc(context, bc_file_path);
...
// Querying the kernel for its attributes.
kernel = create_kernel_helper(bcprog, "test");
cl_int err_code = clGetKernelInfo(kernel, CL_KERNEL_ATTRIBUTES, sizeof(attributes), attributes, &res_size);
...
// Building the expected attributes vector.
std::vector expected;
expected.push_back(std::string("work_group_size_hint(64,1,1)"));
expected.push_back(std::string("vec_type_hint(float4)"));

Please have a check. Thanks.

Start with test_kernel_attributes and its create_program_from_bc path, then compare the CL_KERNEL_ATTRIBUTES expectation with the linked OpenCL specification. Check whether the binary-based test should expect an empty string, and update the test so its result matches the specification.

Written by the indexing model from the issue text.