[PATCH] [Sema] Union(s) cannot have virtual functions

[Davide Italiano]

Example after patching:

$ clang++ union.cpp -o union
union.cpp:2:3: error: function 'f' declared 'virtual' within a union

  virtual void f(...);
  ^

1 error generated.

g++ output, for reference

$ g++5 union.cpp -o union
union.cpp:2:21: error: function 'f' declared virtual inside a union

  virtual void f(...);
                    ^


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http://reviews.llvm.org/D10752

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