Fix #248 (#249)

* Fix up test runner output for compute.

We want compute-based tests to produce a `.actual` file when compilation fails, so we can easily diagnose the issue. I thought I'd added this capability previous, but it seemst to not be present any more.

* Compute result types for constructor decls

Fixes #246

When the parser sees an `init()` declaration, it can't easily know what type is is supposed to return, so it leaves the type as NULL. This was causing some downstream crashes.

Rather than special-case every site that cares about the result type of a callable, we will instead ensure that we install an actual result type on an initializer/constructor as part of its semantic checking.
This code needs to handle both the case where the initializer is declared inside a type, as well as the case where it is declared inside an `extension`.

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