Fix cs0038-1.cs, cs1640-6.cs.

Fix cs0038-1.cs, cs1640-6.cs.
* ecore.cs (Expression.Resolve): Remove special-case for
SimpleName in error-handling.
(Expression.almostMatchedMembers): Relax access permission to
protected.
(Expression.MemberLookupFailed): Handle duplicates in
almostMatchedMembers list.
(SimpleName.DoSimpleNameResolve): Catch CS0038 errors earlier.
* expression.cs (New.DoResolve): Report CS1540 for more cases.
* typemanager.cs (GetFullNameSignature): Use the MethodBase
overload if the passed in MemberInfo is a MethodBase.

svn path=/trunk/mcs/; revision=38783