c++: Modules Is Landing

[Nathan Sidwell]

This is the C++ modules implementation.  Dropping in the real module.cc 
file into the module-shaped hole I carved out.  I include some sanity 
tests for now.  I'll commit the remaining tests when the initial round 
of failures seems abated.

             gcc/cp/
             * module.cc: Replace stubs with implementation.
             gcc/testsuite/
             * g++.dg/modules/mod-decl-0-2a.C: New.
             * g++.dg/modules/mod-decl-0.C: New.
             * g++.dg/modules/mod-decl-1.C: New.
             * g++.dg/modules/mod-decl-2_a.C: New.
             * g++.dg/modules/mod-decl-2_b.C: New.
             * g++.dg/modules/mod-decl-2_c.C: New.
             * g++.dg/modules/mod-decl-3.C: New.
             * g++.dg/modules/mod-decl-5_a.C: New.
             * g++.dg/modules/mod-decl-5_b.C: New.


-- 
Nathan Sidwell
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