Make functions on the built-in object non-writable.

src/x64/full-codegen-x64.cc

 // Copyright 2011 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 723 matching lines @@
 
 void FullCodeGenerator::VisitDeclaration(Declaration* decl) {
   EmitDeclaration(decl->proxy()->var(), decl->mode(), decl->fun());
 }
 
 
 void FullCodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
   // Call the runtime to declare the globals.
   __ push(rsi);  // The context is the first argument.
   __ Push(pairs);
-  __ Push(Smi::FromInt(is_eval() ? 1 : 0));
-  __ Push(Smi::FromInt(strict_mode_flag()));
-  __ CallRuntime(Runtime::kDeclareGlobals, 4);
+  __ Push(Smi::FromInt(DeclareGlobalsFlags()));
+  __ CallRuntime(Runtime::kDeclareGlobals, 3);
   // Return value is ignored.
 }
 
 
 void FullCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
   Comment cmnt(masm_, "[ SwitchStatement");
   Breakable nested_statement(this, stmt);
   SetStatementPosition(stmt);
 
   // Keep the switch value on the stack until a case matches.
@@ skipping 3384 matching lines @@
   __ jmp(rdx);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64