In ilasm/tests:

In ilasm/tests:
	* invalid-method.il: New. Reference to undefined method.
	* invalid-field.il: New. Reference to undefined field.

In ilasm/codegen:
	* CodeGen.cs (CodeGen.Write): Use only filename as the name of the
	module.
	* TypeDef.cs (TypeDef.ResolveAsMethodRef): New.
	(TypeDef.ResolveMethod): Change signature to take ret_type, params
	etc instead of a signature string. Also, if the method does not exist,
	then use ResolveAsMethodRef to return a MethodRef for it.
	(TypeDef.ResolveVarargMethod): Likewise.
	(TypeDef.ResolveField): Likewise.
	* MethodRef.cs (MethodRef.Resolve): Update use of TypeDef.Resolve*
	methods.
	* FieldRef.cs (FieldRef.Resolve): Update use of TypeDef.ResolveField.
	* PropertyDef.cs (PropertyDef.AsMethodDef): Throws an exception is the
	method is not a MethodDef.
	(PropertyDef.Define): Use AsMethodDef to ensure that get/set/other are
	MethodDefs.
	* EventDef.cs (EventDef.AsMethodDef): Same as PropertyDef.
	(EventDef.Define): Likewise.

git-svn-id: svn+ssh://mono-cvs.ximian.com/source/trunk/mcs@57045 e3ebcda4-bce8-0310-ba0a-eca2169e7518