* SerializationCodeGenerator.cs: Generate an integer for unknown enum values.

	* SerializationCodeGenerator.cs: Generate an integer for unknown enum values.
	  Use a special method to generate default values, since default enum values
	  will come as integers, so a special cast is needed.
	* XmlSerializationReaderInterpreter.cs,
	* SerializationSource.cs, SoapAttributeAttribute.cs, SoapAttributeOverrides.cs,
	  SoapAttributes.cs, SoapElementAttribute.cs, SoapEnumAttribute.cs,
	  SoapTypeAttribute.cs, XmlAnyElementAttribute.cs, XmlAnyElementAttributes.cs,
	  XmlArrayAttribute.cs, XmlArrayItemAttribute.cs, XmlArrayItemAttributes.cs,
	  XmlAttributeAttribute.cs, XmlAttributeOverrides.cs, XmlAttributes.cs,
	  XmlChoiceIdentifierAttribute.cs, XmlElementAttribute.cs, XmlElementAttributes.cs,
	  XmlEnumAttribute.cs, XmlReflectionMember.cs, XmlRootAttribute.cs,
	  XmlTextAttribute.cs, XmlTypeAttribute.cs: Had to change the implementation
	  of SerializationSource. It can't keep and use the XmlAttributeOverride
	  instances as key values, since those instances can be modified after the
	  xml map has been generated. Now, SerializationSource generates a unique
	  string hash from XmlAttributeOverride and uses it for comparisons.

svn path=/trunk/mcs/; revision=24553