MFC r269393, r269394, r269395:

  Fix parsing of arch extensions in binutils/gas.
  Use ".arch_extension sec" when compiling ARM TI code that uses the
  security extensions.
MFC r269403, r269405, r269410, r269414:

  Add 64-bit atomic ops for armv6, and also for armv4 only in kernel code.
  Use the new ops in the cddl code (and avoid defining functions with the
  same names locally).