Shader Model 6 wave ops require instructions not available by extension in SPIR-V 1.0, and device support info is found in VkPhysicalDeviceSubgroupProperties, which also has no equivalent by extension in Vulkan 1.0.
-- v3: vkd3d-shader: Introduce a wave ops feature flag. vkd3d: Use Vulkan 1.1 if available. vkd3d-shader: Introduce SPIRV_ENVIRONMENT_VULKAN_1_1.