[v3] more consistent api testing

[Benjamin Kosnik <bkoz at redhat dot com>]

This patch consolidates the existing libstdc++ API tests, makes existing 
practice consistent, and adds new tests.

For "C" includes, all includes are now tested. In addition, as per 
C++2003, types, functions, and macros are now checked. This paves the 
way for a new "C" include strategy that is conformant to the C++ "C" 
compatibility model. (This is in progress but not completed.) There may 
be some breakage, which can be fixed up by either macro guards or 
xfailing certain targets. Before I add the types_gobal_neg.cc tests, I 
thought I'd see where we stand with the types_std.cc tests.

This is consistent with the existing TR1 "C" compatibility tests.

For C++ includes, the following structure is now de rigeur:

requirements/typedefs
requirements/explicit_instantiations
requirements/base_classes

In addition, other type requirements go here. This clears up some 
instantiation inconsistencies (instantiation.cc, 
explicit_instantiation/*.cc, 1.cc, 3.cc, etc.), base_class and typedef 
inconsistencies (mixed in with others) and overall lossage (these should 
be all compile-only tests.)

Explicit instantiation tests are used to test for up to three things:
1) template instantiable.
2) default arguments
3) template definition in correct namespace

Also, synopsis checking is done to sanity check that declarations are 
correct. Surprisingly, <locale>, <unordered_map>, and <unordered_set> 
are xfailed.

All non-template types in C++ headers are checked via using declarations 
(not great, but easy). All templatized types in c++ includes are, in 
theory, checked by instantiation.

I consider this a necessary evolution in the API testing for libstdc++, 
as C++98/C++200x/TR1 are now going to be tested, with high hopes for 
C99/C90 as well. Although not complete, this puts us a bit further along 
than previously.

No test contents were dropped, although the structure has been rearranged.

best,
benjamin

tested x86/linux

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