[Bug sanitizer/58543] Invalid unpoisoning of stack redzones on ARM

[y.gribov at samsung dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58543

--- Comment #1 from Yury Gribov <y.gribov at samsung dot com> ---
Created attachment 30903
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30903&action=edit
Proposed patch