Fix PositiveShaderObject.DrawWithBinaryShaders on 32-bit machines

[spencer-lunarg]

@artem-lunarg I decided to just put the test on the 32-bit blacklist, but we should just fix it properly

the current code has

        size_t data_size;
        vk::GetShaderBinaryDataEXT(*m_device, shaders[i], &data_size, nullptr);
        std::vector<uint8_t> data(data_size);
        vk::GetShaderBinaryDataEXT(*m_device, shaders[i], &data_size, data.data());

the issue is data.data() is sometimes not 16 byte aligned, which it needs to be

we just need a solution to enforce it, then run with https://github.com/LunarG/VulkanTests/pull/805 to ensure it works