Make arguments read only in strict mode.

src/compiler.cc

 // Copyright 2010 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 744 matching lines @@
   function_info->set_start_position(lit->start_position());
   function_info->set_end_position(lit->end_position());
   function_info->set_is_expression(lit->is_expression());
   function_info->set_is_toplevel(is_toplevel);
   function_info->set_inferred_name(*lit->inferred_name());
   function_info->SetThisPropertyAssignmentsInfo(
       lit->has_only_simple_this_property_assignments(),
       *lit->this_property_assignments());
   function_info->set_try_full_codegen(lit->try_full_codegen());
   function_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
+  function_info->set_strict_mode(lit->strict_mode());
 }
 
 
 void Compiler::RecordFunctionCompilation(Logger::LogEventsAndTags tag,
                                          Handle<String> name,
                                          int start_position,
                                          CompilationInfo* info) {
   // Log the code generation. If source information is available include
   // script name and line number. Check explicitly whether logging is
   // enabled as finding the line number is not free.
@@ skipping 24 matching lines @@
                                       code->instruction_size()));
     }
   }
 
   GDBJIT(AddCode(name,
                  Handle<Script>(info->script()),
                  Handle<Code>(info->code())));
 }
 
 } }  // namespace v8::internal