[C++ PATCH] add_method, clone_function_decl

[Nathan Sidwell]

Another cleanup from modules.  Changed the final parms to bool from tree 
and int respectively.  In the former case we were only using its 
non-nullness.

Although cloning a ctor can clone an inherited ctor (via a using-decl), 
we don't need to record the usingness on the complete or base ctors.

nathan
-- 
Nathan Sidwell
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