[es6] add SetFunctionName() behaviour to AssignmentExpression

src/parsing/parser.cc

 // 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.
 
 #include "src/parsing/parser.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-visitor.h"
 #include "src/ast/ast-literal-reindexer.h"
@@ skipping 5435 matching lines @@
     DCHECK(value->IsClassLiteral());
     DCHECK_EQ(ObjectLiteralProperty::COMPUTED, property->kind());
     auto class_literal = value->AsClassLiteral();
     if (class_literal->raw_name() == nullptr) {
       class_literal->set_raw_name(name);
     }
   }
 }
 
 
+void ParserTraits::SetFunctionNameFromIdentifierRef(Expression* value,
+                                                    Expression* identifier) {
+  if (!value->IsFunctionLiteral() && !value->IsClassLiteral()) return;
+  if (!identifier->IsVariableProxy()) return;
+
+  auto name = identifier->AsVariableProxy()->raw_name();
+  DCHECK_NOT_NULL(name);
+
+  if (value->IsFunctionLiteral()) {
+    auto function = value->AsFunctionLiteral();
+    if (function->is_anonymous()) {
+      function->set_raw_name(name);
+    }
+  } else {
+    DCHECK(value->IsClassLiteral());
+    auto class_literal = value->AsClassLiteral();
+    if (class_literal->raw_name() == nullptr) {
+      class_literal->set_raw_name(name);
+    }
+  }
+}
+
+
 }  // namespace internal
 }  // namespace v8