[es6] add SetFunctionName() behaviour to AssignmentExpression

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index faea8b581b4703f01ff7624d73ae977c56ba6e95..760035dc7e6b7851de2264803910e703b8b7725f 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -2126,6 +2126,10 @@ ParserBase<Traits>::ParseAssignmentExpression(bool accept_IN, int flags,
     }
   }
 
+  if (op == Token::ASSIGN && allow_harmony_function_name()) {
+    Traits::SetFunctionNameFromIdentifierRef(right, expression);
+  }
+
   ExpressionT result = factory()->NewAssignment(op, expression, right, pos);
 
   if (is_destructuring_assignment) {