Returns the tree into which the given tree was rewritten using the
#rewrite(com.sun.source.tree.Tree,com.sun.source.tree.Tree) method,
transitively.
Will return the input tree if the input tree was never passed as the first
parameter of the
#rewrite(com.sun.source.tree.Tree,com.sun.source.tree.Tree)method.
Note that the returned tree will be exactly equivalent to a tree passed as
the second parameter to
#rewrite(com.sun.source.tree.Tree,com.sun.source.tree.Tree).
No attribution or other information will be added (or removed) to (or from) the tree.