vulkan_device: Enable shaderStorageImageMultisample conditionally

Fix Vulkan initialization on ANV.

src/video_core/vulkan_common/vulkan_device.cpp

@@ -256,7 +256,7 @@ Device::Device(VkInstance instance_, vk::PhysicalDevice physical_, VkSurfaceKHR
         .shaderTessellationAndGeometryPointSize = false,
         .shaderImageGatherExtended = true,
         .shaderStorageImageExtendedFormats = false,
-        .shaderStorageImageMultisample = true,
+        .shaderStorageImageMultisample = is_shader_storage_image_multisample,
         .shaderStorageImageReadWithoutFormat = is_formatless_image_load_supported,
         .shaderStorageImageWriteWithoutFormat = true,
         .shaderUniformBufferArrayDynamicIndexing = false,
@@ -803,6 +803,7 @@ void Device::SetupFamilies(VkSurfaceKHR surface) {
 void Device::SetupFeatures() {
     const auto supported_features{physical.GetFeatures()};
     is_formatless_image_load_supported = supported_features.shaderStorageImageReadWithoutFormat;
+    is_shader_storage_image_multisample = supported_features.shaderStorageImageMultisample;
     is_blit_depth_stencil_supported = TestDepthStencilBlits();
     is_optimal_astc_supported = IsOptimalAstcSupported(supported_features);
 }

src/video_core/vulkan_common/vulkan_device.h

@@ -273,6 +273,7 @@ private:
     bool is_float16_supported{};            ///< Support for float16 arithmetics.
     bool is_warp_potentially_bigger{};      ///< Host warp size can be bigger than guest.
     bool is_formatless_image_load_supported{};  ///< Support for shader image read without format.
+    bool is_shader_storage_image_multisample{}; ///< Support for image operations on MSAA images.
     bool is_blit_depth_stencil_supported{};     ///< Support for blitting from and to depth stencil.
     bool nv_viewport_swizzle{};                 ///< Support for VK_NV_viewport_swizzle.
     bool khr_uniform_buffer_standard_layout{};  ///< Support for std430 on UBOs.