HDRendeRPipeline: Use Last member for enum

ScriptableRenderPipeline/HDRenderPipeline/Debug/DebugDisplay.cs

             VertexNormalWS,
             VertexColor,
             VertexColorAlpha,
-            // caution if you add something here, it must be use to start enum below
+            Last,
         };
 
         // Number must be contiguous
             None = 0,
-            Depth = DebugViewVarying.VertexColorAlpha + 1,
+            Depth = DebugViewVarying.Last + 1,
-            // caution if you add something here, it must be use to start enum below
+            Last,
         }
 
         // Number must be contiguous
             None = 0,
-            Tessellation = DebugViewGbuffer.BakeShadowMask3 + 1,
+            Tessellation = DebugViewGbuffer.Last + 1,
             PixelDisplacement,
             VertexDisplacement,
             TessellationDisplacement,

ScriptableRenderPipeline/HDRenderPipeline/Debug/DebugDisplay.cs.hlsl

 #define DEBUGVIEWVARYING_VERTEX_NORMAL_WS (7)
 #define DEBUGVIEWVARYING_VERTEX_COLOR (8)
 #define DEBUGVIEWVARYING_VERTEX_COLOR_ALPHA (9)
+#define DEBUGVIEWVARYING_LAST (10)
-#define DEBUGVIEWGBUFFER_DEPTH (10)
-#define DEBUGVIEWGBUFFER_BAKE_DIFFUSE_LIGHTING_WITH_ALBEDO_PLUS_EMISSIVE (11)
-#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK0 (12)
-#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK1 (13)
-#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK2 (14)
-#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK3 (15)
+#define DEBUGVIEWGBUFFER_DEPTH (11)
+#define DEBUGVIEWGBUFFER_BAKE_DIFFUSE_LIGHTING_WITH_ALBEDO_PLUS_EMISSIVE (12)
+#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK0 (13)
+#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK1 (14)
+#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK2 (15)
+#define DEBUGVIEWGBUFFER_BAKE_SHADOW_MASK3 (16)
+#define DEBUGVIEWGBUFFER_LAST (17)
-#define DEBUGVIEWPROPERTIES_TESSELLATION (16)
-#define DEBUGVIEWPROPERTIES_PIXEL_DISPLACEMENT (17)
-#define DEBUGVIEWPROPERTIES_VERTEX_DISPLACEMENT (18)
-#define DEBUGVIEWPROPERTIES_TESSELLATION_DISPLACEMENT (19)
-#define DEBUGVIEWPROPERTIES_DEPTH_OFFSET (20)
-#define DEBUGVIEWPROPERTIES_LIGHTMAP (21)
+#define DEBUGVIEWPROPERTIES_TESSELLATION (18)
+#define DEBUGVIEWPROPERTIES_PIXEL_DISPLACEMENT (19)
+#define DEBUGVIEWPROPERTIES_VERTEX_DISPLACEMENT (20)
+#define DEBUGVIEWPROPERTIES_TESSELLATION_DISPLACEMENT (21)
+#define DEBUGVIEWPROPERTIES_DEPTH_OFFSET (22)
+#define DEBUGVIEWPROPERTIES_LIGHTMAP (23)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.FullScreenDebugMode:  static fields