* class.cs (TypeContainer::RegisterRequiredImplementations):
Record methods we need.
(TypeContainer::MakeKey): Helper function to make keys for
MethodBases, since the Methodbase key is useless.
(TypeContainer::Populate): Call RegisterRequiredImplementations
before defining the methods.
Create a mapping for method_builders_to_methods ahead of time
instead of inside a tight loop.
(::RequireMethods): Accept an object as the data to set into the
hashtable so we can report interface vs abstract method mismatch.
svn path=/trunk/mcs/; revision=1080
