Merge #1627

1627: Merge GCC mainline/master into gccrs/master r=CohenArthur a=ibuclaw

`@doko42` was asking, so here's another merge sync.

Co-authored-by: GCC Administrator <gccadmin@gcc.gnu.org>
Co-authored-by: Andrew MacLeod <amacleod@redhat.com>
Co-authored-by: Liwei Xu <liwei.xu@intel.com>
Co-authored-by: Richard Biener <rguenther@suse.de>
Co-authored-by: Jakub Jelinek <jakub@redhat.com>
Co-authored-by: Andre Vieira <andre.simoesdiasvieira@arm.com>
Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
Co-authored-by: Martin Jambor <mjambor@suse.cz>
Co-authored-by: Joseph Myers <joseph@codesourcery.com>
Co-authored-by: Patrick Palka <ppalka@redhat.com>
Co-authored-by: Florian Weimer <fweimer@redhat.com>
Co-authored-by: Marek Polacek <polacek@redhat.com>
Co-authored-by: liuhongt <hongtao.liu@intel.com>
Co-authored-by: Martin Liska <mliska@suse.cz>
Co-authored-by: Robin Dapp <rdapp@linux.ibm.com>
Co-authored-by: Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp>
Co-authored-by: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>