Backport ustream gcc patch that enables -fdebug-prefix-map to cover
additional cases with LTO enabled to make LTO builds more reproducible.
[YOCTO #14481]
(From OE-Core rev: 8923253b9bc91b14b474abc4923ca916fb8a12ec)
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>