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Ported tailcall phase from scalac with such changes:
- all transformation is done in the phase itself
(previously half of the work was done in backend)
- it is now able to run before uncurry
- it is now a treeTransform
- renamed to tailrec to make it more obvious that
this phase transforms only recursive calls.
For now this is a single phase which speculatively
transforms DefDefs.
Speculation can be potentially removed by
splitting into 2 phases:
one detecting which methods should be transformed
second performing transformation.
But, as transformation requires as same amount of work
as detection, I believe it will be simpler to maintain
it as a single phase.
Conflicts:
tests/pos/typers.scala
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