[patch] Fix pr22849

[Reid Kleckner]

On Tue, Mar 10, 2015 at 6:02 PM, John McCall <rjmccall at apple.com> wrote:

> > On Mar 9, 2015, at 3:05 PM, Rafael Espíndola <rafael.espindola at gmail.com>
> wrote:
> > If I remember correctly, clang's strategy for handling language linkage
> in C is to pretend that C has language linkage and say that everything has
> C language linkage.
> >
> > If that is the case, the attached patch is probably the correct fix.
>
> Hmm.  This is probably a crash/miscompile waiting to happen in a lot of
> different places.  You can produce it in potentially-evaluated code in C++,
> too, in an in-class initializer.
>
> We should probably push a local DeclContext when we enter a
> statement-expression outside of a local context.
>

+1, my first reaction to the reduced test case was, "why are we in a record
declcontext when declaring variables in statement expressions?" Finding a
way to get out of that state seems like a better fix.
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