Reland "Don't compile functions in a context the caller doesn't have access to"

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 07d874bd4e7d5d95efb6a065b26c9c900b0449cb..6a9a721f20319ab7687d3dde57bf4896855469a1 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -587,6 +587,10 @@ DEFINE_BOOL(builtins_in_stack_traces, false,
             "show built-in functions in stack traces")
 DEFINE_BOOL(disable_native_files, false, "disable builtin natives files")
 
+// builtins.cc
+DEFINE_BOOL(allow_unsafe_function_constructor, false,
+            "allow invoking the function constructor without security checks")
+
 // builtins-ia32.cc
 DEFINE_BOOL(inline_new, true, "use fast inline allocation")