Shader: execute RDNA2 FP64 shadow arithmetic and log denorm limits

Shader: disable FP64 denorm preservation controls for now

src/graphics/shader/shader.h

@@ -145,6 +145,7 @@ struct ShaderVertexInputInfo {
 };
 
 struct ShaderComputeInputInfo: ShaderWorkgroupInputInfo {
+	uint8_t            float_mode                 = 0xc0;
 	uint32_t           dispatch_threads_num[3]    = {0, 0, 0};
 	bool               group_id[3]                = {false, false, false};
 	bool               dispatch_thread_dimensions = false;