Changed the clearcloat enable Lua functor to set the forwardPassIBL shader option.

Changed MeshFeatureProcessor to look for this shader option to determine if the material requires forward pass IBL specular.

Gems/Atom/Feature/Common/Assets/Materials/Types/StandardPBR_ClearCoatEnableFeature.lua

@@ -26,4 +26,5 @@ end
 function Process(context)
     local enable = context:GetMaterialPropertyValue_bool("clearCoat.enable")
     context:SetShaderOptionValue_bool("o_clearCoat_feature_enabled", enable)
+    context:SetShaderOptionValue_bool("o_materialUseForwardPassIBLSpecular", enable)
 end

Gems/Atom/Feature/Common/Code/Source/Mesh/MeshFeatureProcessor.cpp

@@ -966,10 +966,25 @@ namespace AZ
 
         bool MeshDataInstance::MaterialRequiresForwardPassIblSpecular(Data::Instance<RPI::Material> material) const
         {
-            RPI::MaterialPropertyIndex propertyIndex = material->FindPropertyIndex(AZ::Name("general.forwardPassIBLSpecular"));
-            if (propertyIndex.IsValid())
+            // look for a shader that has the o_materialUseForwardPassIBLSpecular option set
+            // Note: this should be changed to have the material automatically set the forwardPassIBLSpecular
+            // property and look for that instead of the shader option.
+            // [GFX TODO][ATOM-5040] Address Property Metadata Feedback Loop
+            for (auto& shaderItem : material->GetShaderCollection())
             {
-               return material->GetPropertyValue<bool>(propertyIndex);
+                if (shaderItem.IsEnabled())
+                {
+                    RPI::ShaderOptionIndex index = shaderItem.GetShaderOptionGroup().GetShaderOptionLayout()->FindShaderOptionIndex(Name{ "o_materialUseForwardPassIBLSpecular" });
+                    if (index.IsValid())
+                    {
+                        RPI::ShaderOptionValue value = shaderItem.GetShaderOptionGroup().GetValue(Name{ "o_materialUseForwardPassIBLSpecular" });
+                        if (value.GetIndex() != 0)
+                        {
+                            return true;
+                        }
+                    }
+
+                }
             }
 
             return false;