Fix some deep recursion problems.

They used to be avoided by returning generators in a few places rather
than re-yielding, but I broke that with the context managers.  Oops.

So:

- context.push now returns a new context, which should just be passed
  into the child generator instead of the original context.  This solves
  the awkward problem of returning a generator from within a `with`
  block, where the block will end before the generator is actually
  evaluated.

- The inference cache no longer eagerly evaluates whatever's being
  cached; instead it wraps the original generator in a new one that only
  caches the results once it's done.

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