C++ PATCH for c++/54359 ('this' in trailing-return-type with out-of-class method defn)

[Jason Merrill]

On 03/17/2013 11:45 PM, Jason Merrill wrote:
> This patch caused c++/56639: when within a function we were trying to
> parse something that could be either a declaration or an expression, we
> went to set current_class_ptr and failed the assertion that it wasn't
> already set.  We could save and restore the value

...and now this PR comes along that shows that we really do need to save 
and restore the value.

Tested x86_64-pc-linux-gnu, applying to trunk, and branches later.

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