Rework exception matching.

- Remove typeinfo since thing break if the compiler decides to use the
  system one and merge its contents into typeinfo.h
- Make each type_info object have a vtable with the same layout as the
  public vtable in libstdc++'s <typeinfo>.  This fixes code (e.g.
  libobjc2's Objective-C++ exception handling) which rely on being able
  to add new types.
- Add some extra tests

I suspect exceptions catching pointer-to-member types will not work
correctly, but I've never seen anyone do this and don't have any tests
for it.

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