detail::image_mem_impl destructor may throw an exception even though it is implicitly nothrow

[AlexeySachkov]

The following destructor may throw sycl::exception, but being implicitly nothrow this will result in std::terminate which could be unexpected for our users:

llvm/sycl/source/detail/bindless_images.cpp

Lines 64 to 67 in 83fe1c1

	detail::image_mem_impl::~image_mem_impl() {
	free_image_mem(this->get_handle(), this->get_descriptor().type,
	this->get_device(), this->get_context());
	}

Exception could be thrown here:

llvm/sycl/source/detail/bindless_images.cpp

Lines 219 to 247 in 83fe1c1

	__SYCL_EXPORT void free_image_mem(image_mem_handle memHandle,
	image_type imageType,
	const sycl::device &syclDevice,
	const sycl::context &syclContext) {
	std::shared_ptr<sycl::detail::context_impl> CtxImpl =
	sycl::detail::getSyclObjImpl(syclContext);
	ur_context_handle_t C = CtxImpl->getHandleRef();
	std::shared_ptr<sycl::detail::device_impl> DevImpl =
	sycl::detail::getSyclObjImpl(syclDevice);
	ur_device_handle_t Device = DevImpl->getHandleRef();
	const sycl::detail::AdapterPtr &Adapter = CtxImpl->getAdapter();
	if (memHandle.raw_handle != 0) {
	if (imageType == image_type::mipmap) {
	Adapter->call<sycl::errc::memory_allocation,
	sycl::detail::UrApiKind::urBindlessImagesMipmapFreeExp>(
	C, Device, memHandle.raw_handle);
	} else if (imageType == image_type::standard ||
	imageType == image_type::array ||
	imageType == image_type::cubemap) {
	Adapter->call<sycl::errc::memory_allocation,
	sycl::detail::UrApiKind::urBindlessImagesImageFreeExp>(
	C, Device, memHandle.raw_handle);
	} else {
	throw sycl::exception(sycl::make_error_code(sycl::errc::invalid),
	"Invalid image type to free");
	}
	}
	}

Either from Plugin->call, or just by falling to that else branch at the end which does direct throw