[parser] improve inferred function names for async arrow functions

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 0d16469f3190e582d399752cf5387926922d268a..a00076833681be2eb826342a1dff20f7612c1a1d 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -766,12 +766,13 @@ Literal* ParserTraits::ExpressionFromLiteral(Token::Value token, int pos,
 
 Expression* ParserTraits::ExpressionFromIdentifier(const AstRawString* name,
                                                    int start_position,
-                                                   int end_position) {
-  if (parser_->fni_ != NULL) parser_->fni_->PushVariableName(name);
+                                                   int end_position,
+                                                   InferName infer) {
+  if (infer == InferName::Yes && parser_->fni_ != NULL)
+    parser_->fni_->PushVariableName(name);
   return parser_->NewUnresolved(name, start_position, end_position);
 }
 
-
 Expression* ParserTraits::ExpressionFromString(int pos, Scanner* scanner,
                                                AstNodeFactory* factory) {
   const AstRawString* symbol = GetSymbol(scanner);