FPORT: Fixes incremental compiler missing member ref from macro expansion #111
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This is forward porting of sbt/sbt#2563
Fix sbt/sbt#2560
traverse(tree: Tree) used to call super.traverse(tree) at the end.
sbt/sbt@0f61629 brought the traversing
call to inside of the pattern matching.
For the case of MacroExpansionOf(original), it amounts to not traveling
the macro-expanded code. See
sbt/src/sbt-test/source-dependencies/macro-nonarg-dep for the repro.