ShaderLab code timing issues

[zhuxudong]

original code:

#ifndef direct

  DirectLight directionalLight;
        for ( int i = 0; i < SCENE_DIRECT_LIGHT_COUNT; i ++ ) {
            // warning: use `continue` syntax may trigger flickering bug in safri 16.1.
            if(!isRendererCulledByLight(renderer_Layer.xy, scene_DirectLightCullingMask[i])){
                directionalLight.color = scene_DirectLightColor[i];
                #ifdef SCENE_IS_CALCULATE_SHADOWS
                    if (i == 0) { // Sun light index is always 0
                        directionalLight.color *= shadowAttenuation;
                    }
                #endif
                directionalLight.direction = scene_DirectLightDirection[i];
                addDirectionalDirectLightRadiance( directionalLight, surfaceData, color );
            }
        }


#endif

after compile

for (int  i = 0; i < SCENE_DIRECT_LIGHT_COUNT; i++) { 
0:1004    if (!isRendererCulledByLight(renderer_Layer.xy, scene_DirectLightCullingMask[i]))
0:1005  { 
0:1006    directionalLight.color  = scene_DirectLightColor[i];
0:1007  #ifdef SCENE_IS_CALCULATE_SHADOWS
0:1008   
0:1009  if (i == 0)
0:1010  { 
0:1011    directionalLight.color  *= shadowAttenuation;
0:1012  }
0:1013  
0:1014  
0:1015  #endif
0:1016  directionalLight.direction  = scene_DirectLightDirection[i];
0:1017  addDirectionalDirectLightRadiance(directionalLight, surfaceData, color);
0:1018  }
0:1019  
0:1020  
0:1021  }
0:1022  DirectLight directionalLight;

[Sway007]

fixed at #2087