Compute outer.path in lambdaLift at correct phase.

LambdaLift needs to compute outer.path at the phase in which
the results are constructed, i.e. phase lambdaLift.next. Or else
we get an error in outer.path for lost fo files, including pos/Fileish.scala
as a minimized test case. Previously outer as computed at phase lambdaLift.
The reason for this is that lambdaLift name mangles inner classes, which
causes outer acessors to be not found. We now correct for the problem
in outer.path itself, by calling outerAccessor only at a safe phase.

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