Replaced the two clear shadow passes with one using the platform far plane define.

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Shadow/Resources/ShadowClear.shader

         #pragma only_renderers d3d11 ps4 xboxone vulkan metal
 
         #include "CoreRP/ShaderLibrary/Common.hlsl"
-
-
-        float4 Frag() : SV_Target { return 0.0.xxxx; }
-
     ENDHLSL
 
     SubShader
-            Name "ClearShadow_0"
+            Name "ClearShadow"
             ZTest Always
             Cull Off
             ZWrite On
 
             float4 Vert_0( uint vertexID : VERTEXID_SEMANTIC ) : SV_POSITION
             {
-                return GetFullScreenTriangleVertexPosition( vertexID, 0.0 );
+                return GetFullScreenTriangleVertexPosition( vertexID, UNITY_RAW_FAR_CLIP_VALUE );
-            ENDHLSL
-        }
-
-        Pass
-        {
-            Name "ClearShadow_1"
-            ZTest Always
-            Cull Off
-            ZWrite On
+            float4 Frag() : SV_Target{ return 0.0.xxxx; }
-            HLSLPROGRAM
-
-            #pragma vertex Vert_1
-            #pragma fragment Frag
-            
-            float4 Vert_1( uint vertexID : VERTEXID_SEMANTIC ) : SV_POSITION
-            {
-                return GetFullScreenTriangleVertexPosition( vertexID, 1.0 );
-            }
-
     }
     Fallback Off
 }

ScriptableRenderPipeline/Core/CoreRP/Shadow/Shadow.cs

                 cmd.SetViewport( m_EntryCache[i].current.viewport );
                 cbName = "Shadowmap.ClearRect";
                 cmd.BeginSample( cbName );
-                CoreUtils.DrawFullScreen( cmd, m_ClearMat, null, SystemInfo.usesReversedZBuffer ? 0 : 1 );
+                CoreUtils.DrawFullScreen( cmd, m_ClearMat, null, 0 );
                 cmd.EndSample( cbName );
                 cmd.SetViewProjectionMatrices( m_EntryCache[i].current.view, m_EntryCache[i].current.proj );
                 cmd.SetGlobalVector( "g_vLightDirWs", m_EntryCache[i].current.lightDir );