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

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 799ba73a26328d62e60c36807af3d3ef0dcf8335..762974f9ef89ccde611453046d9e0f8efeeb9272 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -770,9 +770,8 @@ void FullCodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
   // Call the runtime to declare the globals.
   __ push(esi);  // The context is the first argument.
   __ push(Immediate(pairs));
-  __ push(Immediate(Smi::FromInt(is_eval() ? 1 : 0)));
-  __ push(Immediate(Smi::FromInt(strict_mode_flag())));
-  __ CallRuntime(Runtime::kDeclareGlobals, 4);
+  __ push(Immediate(Smi::FromInt(DeclareGlobalsFlags())));
+  __ CallRuntime(Runtime::kDeclareGlobals, 3);
   // Return value is ignored.
 }