A user reported that there is an unused parameter in UnityGlobalIllumination shader file.

1) In UnityGlobalIllumination,cginc, bakedColorTex argument in SubtractMainLightWithRealtimeAttenuationFromLightmap method is not used.

2) He suggests changing SubtractMainLightWithRealtimeAttenuationFromLightmap from

inline half3 SubtractMainLightWithRealtimeAttenuationFromLightmap (half3 lightmap, half attenuation, half4 bakedColorTex, half3 normalWorld)

to

inline half3 SubtractMainLightWithRealtimeAttenuationFromLightmap (half3 lightmap, half attenuation, half3 normalWorld)