Represent implicit 'this' binding by 'super' in AST.

src/compiler/ast-loop-assignment-analyzer.cc

Index: src/compiler/ast-loop-assignment-analyzer.cc
diff --git a/src/compiler/ast-loop-assignment-analyzer.cc b/src/compiler/ast-loop-assignment-analyzer.cc
index e0a92a464c487e7e1b74b88321d28298c2502f33..61ed4f27cbba8e7d7b9287108a87ab9e8f3435e2 100644
--- a/src/compiler/ast-loop-assignment-analyzer.cc
+++ b/src/compiler/ast-loop-assignment-analyzer.cc
@@ -161,11 +161,6 @@ void ALAA::VisitProperty(Property* e) {
 void ALAA::VisitCall(Call* e) {
   Visit(e->expression());
   VisitExpressions(e->arguments());
-  // TODO(mstarzinger): It sure would be nice if this were desugared.
-  if (e->GetCallType(isolate()) == Call::SUPER_CALL) {
-    SuperCallReference* super = e->expression()->AsSuperCallReference();
-    AnalyzeAssignment(super->this_var()->var());
-  }
 }