Fixed a compilation error after merging.

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/LightweightPassLit.hlsl

 #endif
 
 #if SHADER_HINT_NICE_QUALITY
-    inputData.viewDirectionWS = SafeNormalize(IN.viewDir);
+    inputData.viewDirectionWS = SafeNormalize(viewDir);
-    inputData.viewDirectionWS = IN.viewDir;
+    inputData.viewDirectionWS = viewDir;
 #endif
 
     inputData.shadowCoord = IN.shadowCoord;