Fix up instancing from graph.

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/LightweightPipeline/LightWeightPBRSubShader.cs

-using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
             foreach (var channel in graphRequiements.requiresMeshUVs.Distinct())
                 vertexInputs.AddShaderChunk(string.Format("float4 texcoord{0} : TEXCOORD{0};", (int)channel), false);
             
+            vertexInputs.AddShaderChunk("UNITY_VERTEX_INPUT_INSTANCE_ID", true);
             vertexInputs.Deindent();
             vertexInputs.AddShaderChunk("};", false);
         }
             var cullingVisitor = new ShaderGenerator();
             var zTestVisitor = new ShaderGenerator();
             var zWriteVisitor = new ShaderGenerator();
-
 
             materialOptions.GetBlend(blendingVisitor);
             materialOptions.GetCull(cullingVisitor);

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Templates/lightweightPBRForwardPass.template

 		half4 fogFactorAndVertexLight : TEXCOORD1; // x: fogFactor, yzw: vertex light
     	float4 shadowCoord            : TEXCOORD2;
         ${Interpolators}
+        UNITY_VERTEX_INPUT_INSTANCE_ID
     };
 
     GraphVertexOutput vert (GraphVertexInput v)
         GraphVertexOutput o = (GraphVertexOutput)0;
+
+        UNITY_SETUP_INSTANCE_ID(v);
+    	UNITY_TRANSFER_INSTANCE_ID(v, o);
 
         ${VertexShader}
 
 
 	half4 frag (GraphVertexOutput IN) : SV_Target
     {
+
+    	UNITY_SETUP_INSTANCE_ID(IN);
+
     	${LocalPixelShader}
 
         SurfaceInputs surfaceInput = (SurfaceInputs)0;