Fix performance degradation in converters because the instance was not reused.

Author: cincuranet

src/EFCore/Storage/Json/JsonConvertedValueReaderWriter.cs

@@ -55,5 +55,8 @@ public override Expression ConstructorExpression
         => Expression.New(
             _constructorInfo,
             ((ICompositeJsonValueReaderWriter)this).InnerReaderWriter.ConstructorExpression,
-            ((IJsonConvertedValueReaderWriter)this).Converter.ConstructorExpression);
+            // We shouldn't quote converters, because every new instance will have to compile
+            // the expression again and it will have a negative performance impact.
+            // This means this is currently unsupported scenario for precompilation.
+            Expression.Constant(((IJsonConvertedValueReaderWriter)this).Converter));
 }