Patch to fix IRGen crash using lambda expression as value in dictionary literal

[jahanian]

On Sep 16, 2014, at 5:44 PM, Reid Kleckner <rnk at google.com> wrote:

> I mean, there's got to be a way to inject some destructor cleanups into the lambda, like:
> 
> struct A { ~A(); };
> int f(A) { return 42; }
> id test_dict()
> {
>         return @{
>                 @"a": [x=f(A())]() { return x; },
>                 @"b": [x=f(A())]() { return x; }
>         };
> }
> 
> Does this change affect where ~A gets called?
> 

With John’s suggested patch I sent earlier, cleanup code to effect conversion to block expression is moved to
where outer-most expression (one passed to return) is seen. So, new patch does not affect where ~A
gets called.

- fariborz