Fix position of Bind nodes
Fix position of Bind nodes

The position of a tree should contain the position of all its children,
but that was not the case before this commit for Bind nodes created from
Typed nodes.

dotty-staging/dotty,som-snytt/dotty,som-snytt/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,som-snytt/dotty,lampepfl/dotty,sjrd/dotty,som-snytt/dotty,sjrd/dotty,dotty-staging/dotty,dotty-staging/dotty,dotty-staging/dotty,som-snytt/dotty,sjrd/dotty,sjrd/dotty,lampepfl/dotty,sjrd/dotty,lampepfl/dotty