c++: Module API declarations

[Nathan Sidwell]

Here are the declarations of module.cc.  I'll fill these in with 
nop-stubs when adding the remaining pieces of the modules 
infrastructure.  Finally replacing the contents of module.cc with the 
real thing when victory is within reach.

This provides the inline predicates about module state,	and declares
the functions to be provided.

         gcc/cp/
         * cp-tree.h: Add various inline module state predicates, and
         declare the API that will be provided by modules.cc

pushing to trunk
-- 
Nathan Sidwell
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