[parser] improve inferred function names for async arrow functions

src/parsing/func-name-inferrer.h

 // Copyright 2006-2009 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_FUNC_NAME_INFERRER_H_
 #define V8_PARSING_FUNC_NAME_INFERRER_H_
 
 #include "src/handles.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 class AstRawString;
 class AstString;
 class AstValueFactory;
 class FunctionLiteral;
 
+enum class InferName { Yes, No };
+
 // FuncNameInferrer is a stateful class that is used to perform name
 // inference for anonymous functions during static analysis of source code.
 // Inference is performed in cases when an anonymous function is assigned
 // to a variable or a property (see test-func-name-inference.cc for examples.)
 //
 // The basic idea is that during parsing of LHSs of certain expressions
 // (assignments, declarations, object literals) we collect name strings,
 // and during parsing of the RHS, a function literal can be collected. After
 // parsing the RHS we can infer a name for function literals that do not have
 // a name.
@@ skipping 35 matching lines @@
       funcs_to_infer_.Add(func_to_infer, zone());
     }
   }
 
   void RemoveLastFunction() {
     if (IsOpen() && !funcs_to_infer_.is_empty()) {
       funcs_to_infer_.RemoveLast();
     }
   }
 
+  void RemoveAsyncKeywordFromEnd();
+
   // Infers a function name and leaves names collection state.
   void Infer() {
     DCHECK(IsOpen());
     if (!funcs_to_infer_.is_empty()) {
       InferFunctionsNames();
     }
   }
 
  private:
   enum NameType {
@@ skipping 34 matching lines @@
   Zone* zone_;
 
   DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_FUNC_NAME_INFERRER_H_