Faster invocation of custom comparator function.

src/codegen.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 86 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 
 #define INLINE_RUNTIME_FUNCTION_LIST(F) \
   F(IsSmi, 1, 1)                                                             \
   F(IsNonNegativeSmi, 1, 1)                                                  \
   F(IsArray, 1, 1)                                                           \
   F(IsRegExp, 1, 1)                                                          \
+  F(CallFunction, -1 /* receiver + n args + function */, 1)                  \
   F(IsConstructCall, 0, 1)                                                   \
   F(ArgumentsLength, 0, 1)                                                   \
   F(Arguments, 1, 1)                                                         \
   F(ClassOf, 1, 1)                                                           \
   F(ValueOf, 1, 1)                                                           \
   F(SetValueOf, 2, 1)                                                        \
   F(FastCharCodeAt, 2, 1)                                                    \
   F(CharFromCode, 1, 1)                                                      \
   F(ObjectEquals, 2, 1)                                                      \
   F(Log, 3, 1)                                                               \
@@ skipping 482 matching lines @@
  private:
   Major MajorKey() { return ToBoolean; }
   int MinorKey() { return 0; }
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_