Shader changes to support XR in Lightweight Pipeline

Assets/ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightPipeline.shader

             #pragma shader_feature _EMISSION
             #pragma shader_feature _ _REFLECTION_CUBEMAP _REFLECTION_PROBE
 
+            #pragma multi_compile _ UNITY_SINGLE_PASS_STEREO STEREO_INSTANCING_ON STEREO_MULTIVIEW_ON
             #pragma multi_compile _ _SINGLE_DIRECTIONAL_LIGHT
             #pragma multi_compile _ LIGHTMAP_ON
             #pragma multi_compile _ _LIGHT_PROBES_ON
             v2f vert(LightweightVertexInput v)
             {
                 v2f o = (v2f)0;
+
+                UNITY_SETUP_INSTANCE_ID(v);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
 
                 o.uv01.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
                 o.uv01.zw = v.lightmapUV * unity_LightmapST.xy + unity_LightmapST.zw;

Assets/ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightPipelineCore.cginc

     float4 tangent : TANGENT;
     float3 texcoord : TEXCOORD0;
     float2 lightmapUV : TEXCOORD1;
+    UNITY_VERTEX_INPUT_INSTANCE_ID
 };
 
 struct v2f
     half4 viewDir : TEXCOORD5; // xyz: viewDir
     UNITY_FOG_COORDS_PACKED(6, half4) // x: fogCoord, yzw: vertexColor
     float4 hpos : SV_POSITION;
+    UNITY_VERTEX_OUTPUT_STEREO
 };
 
 // Per object light list data

Assets/ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightUnlit.shader

             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
+            #pragma multi_compile _ UNITY_SINGLE_PASS_STEREO STEREO_INSTANCING_ON STEREO_MULTIVIEW_ON
             #pragma multi_compile_fog
             #pragma shader_feature _ _ALPHATEST_ON _ALPHABLEND_ON
 
             {
                 float4 vertex : POSITION;
                 float2 uv : TEXCOORD0;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
             };
 
             struct v2f
                 float4 vertex : SV_POSITION;
+                UNITY_VERTEX_OUTPUT_STEREO
             };
 
             sampler2D _MainTex;
             v2f vert(appdata v)
             {
                 v2f o;
+
+                UNITY_SETUP_INSTANCE_ID(v);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+
                 o.vertex = UnityObjectToClipPos(v.vertex);
                 o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                 UNITY_TRANSFER_FOG(o,o.vertex);