...And add the feature flag to Vulkan, which previously worked by accident.

wgpu-hal/src/vulkan/adapter.rs

@@ -203,6 +203,7 @@ impl PhysicalDeviceFeatures {
     fn to_wgpu(&self, caps: &PhysicalDeviceCapabilities) -> (wgt::Features, wgt::DownlevelFlags) {
         use wgt::{DownlevelFlags as Df, Features as F};
         let mut features = F::empty()
+            | F::SPIR_V_SHADER_MODULES
             | F::MAPPABLE_PRIMARY_BUFFERS
             | F::PUSH_CONSTANTS
             | F::ADDRESS_MODE_CLAMP_TO_BORDER