Find instances using GHC, which is more complete.

In particular, it works cross-package.

An intermediate patch also moved the instance-finding into
createInterface, but that move turned out not to be necessary,
so if we want to do that, it'd go in a separate patch.
(Is that possible? Or will we need GHC to have loaded all the modules
first, before we can go searching for the instances (e.g. if the
modules are recursive or something)?)

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