[es6] add SetFunctionName() behaviour to AssignmentExpression

src/parsing/parser-base.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PARSER_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/hashmap.h"
@@ skipping 2108 matching lines @@
     // name if we're dealing with "a = function(){...}();"-like
     // expression.
     if ((op == Token::INIT || op == Token::ASSIGN) &&
         (!right->IsCall() && !right->IsCallNew())) {
       fni_->Infer();
     } else {
       fni_->RemoveLastFunction();
     }
   }
 
+  if (op == Token::ASSIGN && allow_harmony_function_name()) {
+    Traits::SetFunctionNameFromIdentifierRef(right, expression);
+  }
+
   ExpressionT result = factory()->NewAssignment(op, expression, right, pos);
 
   if (is_destructuring_assignment) {
     result = factory()->NewRewritableAssignmentExpression(result);
     Traits::QueueDestructuringAssignmentForRewriting(result);
   }
 
   return result;
 }
 
@@ skipping 1207 matching lines @@
       return;
     }
     has_seen_constructor_ = true;
     return;
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H