Bring in branch-8 bugfixes into GCC80.Bugfixes as of April 15.Huge thanks to gcc developers for keeping longterm branches andbackporting/testing all the bugfixes.
Update GCC80 to version 8.3
Import GCC-8 to a new vendor branch
gcc80: Handle TZ specific "%+" format in strftime.After removal of %b and %r formats from kernel,only one extra format remains.Requested-by: swildner