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e6b4204604 moved access widenings from ExplicitOuter to
SuperAccessors to reflect them in pickled signatures so
that the inliner can take advantage of them under separate
compilation.
The followup discussion [1] determined that this wasn't
the right solution: while it enabled new separate compilation
inlinings, it failed to widen access of outer pointers and
hence prevented certain inlinings.
A better solution was proposed: modify the inliner to know
that access widening is guaranteed to have happened in
ExplicitOuter for any field accessed by an @inline-d method
body, rather than relying solely on the pickled types.
But this hasn't happened yet. In the meantime 07f94297 / #1121
reinstated the access widening to SuperAccessors, but took a
slightly different approach, using `Symbol#enclMethod` rather
than `closestEnclMethod`. That deviation triggers SI-6562.
This commit goes back to `closestEnclMethod`.
[1] https://groups.google.com/forum/#!topic/scala-internals/iPkMCygzws4
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