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The issue is subtle: the `tp` in scope in `def ofTypeImplicits` is the
`tp` passed to the top-level `implicitScope` method, not the `tp` passed
to the recursively called `iscope`, this means that before this commit,
all intermediate `OfTypeImplicit` scopes cached while computing an
implicit scope had their `tp` field incorrectly set, which means that we
could miss implicits in later implicit searches.
Note that the `implicit_cache.scala` test worked before this commit
because of the restrictions on caching that exist since
b8b0f381ef2cbcb7bad66fd3e7a9ae929baa45f6, it is included anyway because
our caching strategy might change in the future.
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