%X => %_X, %_X => %__X

src/ast.cc

 // Copyright 2012 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 1069 matching lines @@
 DONT_CACHE_NODE(ModuleLiteral)
 
 void AstConstructionVisitor::VisitCallRuntime(CallRuntime* node) {
   increase_node_count();
   if (node->is_jsruntime()) {
     // Don't try to inline JS runtime calls because we don't (currently) even
     // optimize them.
     add_flag(kDontInline);
   } else if (node->function()->intrinsic_type == Runtime::INLINE &&
       (node->name()->IsOneByteEqualTo(
-          STATIC_ASCII_VECTOR("_ArgumentsLength")) ||
-       node->name()->IsOneByteEqualTo(STATIC_ASCII_VECTOR("_Arguments")))) {
+          STATIC_ASCII_VECTOR("__ArgumentsLength")) ||
+       node->name()->IsOneByteEqualTo(STATIC_ASCII_VECTOR("__Arguments")))) {
     // Don't inline the %_ArgumentsLength or %_Arguments because their
     // implementation will not work.  There is no stack frame to get them
     // from.
     add_flag(kDontInline);
   }
 }
 
 #undef REGULAR_NODE
 #undef DONT_OPTIMIZE_NODE
 #undef DONT_INLINE_NODE
@@ skipping 12 matching lines @@
     OS::SNPrintF(buffer, "%d", Smi::cast(*handle_)->value());
     str = arr;
   } else {
     str = DoubleToCString(handle_->Number(), buffer);
   }
   return FACTORY->NewStringFromAscii(CStrVector(str));
 }
 
 
 } }  // namespace v8::internal