Changed local shadow strength to use a float array instead of vec4 so we can do fast indexing on most platforms.

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightConstantBuffer.cs

     public static class LocalShadowConstantBuffer
     {
         public static int _LocalWorldToShadowAtlas;
-        public static int _LocalShadowData;
+        public static int _LocalShadowStrength;
         public static int _LocalShadowOffset0;
         public static int _LocalShadowOffset1;
         public static int _LocalShadowOffset2;

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShadowPass.cs

             DirectionalShadowConstantBuffer._ShadowmapSize = Shader.PropertyToID("_ShadowmapSize");
 
             LocalShadowConstantBuffer._LocalWorldToShadowAtlas = Shader.PropertyToID("_LocalWorldToShadowAtlas");
-            LocalShadowConstantBuffer._LocalShadowData = Shader.PropertyToID("_LocalShadowData");
+            LocalShadowConstantBuffer._LocalShadowStrength = Shader.PropertyToID("_LocalShadowStrength");
             LocalShadowConstantBuffer._LocalShadowOffset0 = Shader.PropertyToID("_LocalShadowOffset0");
             LocalShadowConstantBuffer._LocalShadowOffset1 = Shader.PropertyToID("_LocalShadowOffset1");
             LocalShadowConstantBuffer._LocalShadowOffset2 = Shader.PropertyToID("_LocalShadowOffset2");
 
             cmd.SetGlobalTexture(m_LocalShadowmapID, m_LocalShadowmapTexture);
             cmd.SetGlobalMatrixArray(LocalShadowConstantBuffer._LocalWorldToShadowAtlas, m_LocalShadowMatrices);
-            cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowData, new Vector4(m_LocalShadowStrength[0], m_LocalShadowStrength[1], m_LocalShadowStrength[2], m_LocalShadowStrength[3]));
+            cmd.SetGlobalFloatArray(LocalShadowConstantBuffer._LocalShadowStrength, m_LocalShadowStrength);
             cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset0, new Vector4(-invHalfShadowAtlasWidth, -invHalfShadowAtlasHeight, 0.0f, 0.0f));
             cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset1, new Vector4( invHalfShadowAtlasWidth, -invHalfShadowAtlasHeight, 0.0f, 0.0f));
             cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset2, new Vector4(-invHalfShadowAtlasWidth,  invHalfShadowAtlasHeight, 0.0f, 0.0f));

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/Shadows.hlsl

 
 CBUFFER_START(_LocalShadowBuffer)
 float4x4    _LocalWorldToShadowAtlas[4];
+half        _LocalShadowStrength[4];
-half4       _LocalShadowData;    // (x: shadowStrength)
 float4      _LocalShadowmapSize; // (xy: 1/width and 1/height, zw: width and height)
 CBUFFER_END
 
 
 half GetLocalLightShadowStrenth(int lightIndex)
 {
-    return _LocalShadowData[lightIndex];
+    return _LocalShadowStrength[lightIndex];
 }
 
 half SampleScreenSpaceShadowMap(float4 shadowCoord)