C++ PATCH for c++/38798 (auto f() -> struct A {})

[Jason Merrill]

DR 770 clarified that we shouldn't try to parse a class or 
enum-specifier in the context of a trailing return type.  I've 
implemented that with a flag passed down into cp_parser_type_specifier.

Tested x86_64-pc-linux-gnu, applied to trunk.
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