Merge remote-tracking branch \'toybox/master\' into HEAD

am: 498e61d5a4

* commit '498e61d5a4361d4a225947386ac8150292dcc466':
  Use CFG_TOYBOX_NORECURSE to avoid <strike>all that tedious mucking about with hyperspace</strike> stack measuring in ways that confuse security stuff.
  Work around increasingly insane compiler developers wanting to make everything undefined behavior so the optimizer can silently eliminate your entire program.

Change-Id: I77b6cdd91936a6a7c887c74a056e57b171543882