[cleanup] Split ForOf and ForIn AST nodes apart as they share little

src/crankshaft/typing.cc

Index: src/crankshaft/typing.cc
diff --git a/src/crankshaft/typing.cc b/src/crankshaft/typing.cc
index 69d7efed6352bc40cb7b8706500f4c2007413ce2..31b87f29e3c4fd1dce1b6d545a31d17aed4a7649 100644
--- a/src/crankshaft/typing.cc
+++ b/src/crankshaft/typing.cc
@@ -304,14 +304,7 @@ void AstTyper::VisitForInStatement(ForInStatement* stmt) {
   store_.Forget();  // Control may transfer here via 'break'.
 }
 
-
-void AstTyper::VisitForOfStatement(ForOfStatement* stmt) {
-  RECURSE(Visit(stmt->iterable()));
-  store_.Forget();  // Control may transfer here via looping or 'continue'.
-  RECURSE(Visit(stmt->body()));
-  store_.Forget();  // Control may transfer here via 'break'.
-}
-
+void AstTyper::VisitForOfStatement(ForOfStatement* stmt) {}
 
 void AstTyper::VisitTryCatchStatement(TryCatchStatement* stmt) {
   Effects try_effects = EnterEffects();