Update liverpool_to_vk.cpp

Update

src/video_core/renderer_vulkan/liverpool_to_vk.cpp

@@ -224,7 +224,7 @@ vk::CompareOp DepthCompare(AmdGpu::DepthCompare comp) {
         return vk::CompareOp::eAlways;
     /// Missing AMG Gpu default statement
     default:
-        throw std::invalid_argument("Unsupported DeepCompare");
+        UNREACHABLE_MSG("Unknown depth compare op {}", u32(comp));
     }
 }