Fix assertion failure

Author: RikkiGibson

src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_CollectionExpression.cs

@@ -912,7 +912,7 @@ private BoundExpression CreateAndPopulateList(BoundCollectionExpression node, Ty
 
                         var type = rewrittenSpreadOperand.Type!;
 
-                        CompoundUseSiteInfo<AssemblySymbol> useSiteInfo = default;
+                        var useSiteInfo = GetNewCompoundUseSiteInfo();
                         var conversion = _compilation.Conversions.ClassifyConversionFromType(type, addRangeMethod.Parameters[0].Type, isChecked: false, ref useSiteInfo);
                         _diagnostics.Add(rewrittenSpreadOperand.Syntax, useSiteInfo);
                         if (conversion.IsImplicit && conversion.IsReference)