[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..6384194445c34441bae1df8e15e6d06c9da5a16c 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -766,8 +766,11 @@ 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);
 }