Use the same stencil value for all non-SSS materials

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.cs

                                 {
                                     // The stencil test uses a LESS comparison mode.
                                     // If asked to disable SSS, we set the material ID of SSS materials to Standard, and shade all pixels with non-zero stencil values.
-                                    m_DeferredAllMaterialSRT.SetInt("_StencilRef", (int)(debugDisplaySettings.renderingDebugSettings.enableSSS ? StencilBits.Standard : StencilBits.SSS));
+                                    m_DeferredAllMaterialSRT.SetInt("_StencilRef", (int)(debugDisplaySettings.renderingDebugSettings.enableSSS ? StencilBits.NonSSS : StencilBits.SSS));
 
                                     Utilities.SelectKeyword(m_DeferredAllMaterialSRT, "USE_CLUSTERED_LIGHTLIST", "USE_FPTL_LIGHTLIST", bUseClusteredForDeferred);
                                     Utilities.DrawFullScreen(cmd, m_DeferredAllMaterialSRT, hdCamera, colorBuffers[0], depthStencilBuffer);

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

         _HorizonFade("Horizon fade", Range(0.0, 5.0)) = 1.0
 
         // Stencil state
-        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.Standard (fixed at compile time)
+        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.NonSSS (fixed at compile time)
 
         // Blending state
         [HideInInspector] _SurfaceType("__surfacetype", Float) = 0.0

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitTessellation.shader

         _HorizonFade("Horizon fade", Range(0.0, 5.0)) = 1.0
 
         // Stencil state
-        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.Standard (fixed at compile time)
+        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.NonSSS (fixed at compile time)
 
         // Blending state
         [HideInInspector] _SurfaceType("__surfacetype", Float) = 0.0

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/BaseLitUI.cs

 using System;
 using UnityEngine;
 using UnityEngine.Rendering;
+using UnityEngine.Experimental.Rendering.HDPipeline;
 
 namespace UnityEditor.Experimental.Rendering.HDPipeline
 {
             SetKeyword(material, "_DEPTHOFFSET_ON", depthOffsetEnable);
 
             // Set the reference value for the stencil test.
-            int stencilRef = (int)UnityEngine.Experimental.Rendering.HDPipeline.StencilBits.Standard;
+            int stencilRef = (int)StencilBits.NonSSS;
-                stencilRef = 1 + (int)material.GetFloat(kMaterialID);
+                if ((int)material.GetFloat(kMaterialID) == (int)UnityEngine.Experimental.Rendering.HDPipeline.Lit.MaterialId.LitSSS)
+                {
+                    stencilRef = (int)StencilBits.SSS;
+                }
             }
             material.SetInt(kStencilRef, stencilRef);
 

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

         // into function like GetSpecularDominantDir(). However modified normal is just a hack. The goal is just to stretch a cubemap, no accuracy here.
         // With this in mind and for performance reasons we chose to only use modified normal to calculate R.
         iblR = reflect(-V, anisoIblNormalWS);
-        // @Sébastien: I preserved the original behavior by creating 'anisoIblNormalWS', but,
-        // from the performance standpoint, it would be best to store the value in 'iblNormalWS'
-        // and then use it in GetSpecularDominantDir(). Please reconsider. :-) -Evgenii
     }
 
     // IBL

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         _HorizonFade("Horizon fade", Range(0.0, 5.0)) = 1.0
 
         // Stencil state
-        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.Standard
+        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.NonSSS
 
         // Blending state
         [HideInInspector] _SurfaceType("__surfacetype", Float) = 0.0

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

         _HorizonFade("Horizon fade", Range(0.0, 5.0)) = 1.0
 
         // Stencil state
-        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.Standard
+        [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilBits.NonSSS
 
         // Blending state
         [HideInInspector] _SurfaceType("__surfacetype", Float) = 0.0

Assets/ScriptableRenderPipeline/HDRenderPipeline/Utilities.cs

     [Flags]
     public enum StencilBits
     {
-        None      = 0,                              // 0
-        SSS       = 1 + Lit.MaterialId.LitSSS,      // 1
-        Standard  = 1 + Lit.MaterialId.LitStandard, // 2
-        All       = 255                             // 0xFF
+        None   = 0,                         // 0
+        SSS    = 1 + Lit.MaterialId.LitSSS, // 1
+        NonSSS = 2 + Lit.MaterialId.LitSSS, // 2
+        All    = 255                        // 0xFF
     }
 
     public class Utilities