Parser: Refactor strict mode checks for functions

src/parser.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_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // For CachedDataMode
@@ skipping 498 matching lines @@
                                 int pos);
 
   // Generic AST generator for throwing errors from compiled code.
   Expression* NewThrowError(
       const AstString* constructor, const char* type,
       const AstString* arg, int pos);
 
   // Reporting errors.
   void ReportMessageAt(Scanner::Location source_location,
                        const char* message,
-                       const char* arg,
+                       const char* arg = NULL,
                        bool is_reference_error = false);
   void ReportMessage(const char* message,
                      const char* arg = NULL,
                      bool is_reference_error = false);
   void ReportMessage(const char* message,
                      const AstString* arg,
                      bool is_reference_error = false);
   void ReportMessageAt(Scanner::Location source_location,
                        const char* message,
                        const AstString* arg,
@@ skipping 313 matching lines @@
  private:
   static const int kLiteralTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_