gcc-9 (9.3.0-21) unstable; urgency=medium
* Update to git
20210202 from the gcc-9 branch.
- Fix PR lto/85574, PR tree-optimization/97627, PR target/98618 (AArch64),
PR ada/98228, PR ada/98740, PR c++/63707, PR fortran/86470,
PR fortran/98517, PR fortran/93833, PR fortran/98022, PR fortran/98022,
PR fortran/91640, PR libgomp/65099, PR d/98806, PR d/98921,
PR libstdc++/98605, PR libstdc++/96083, PR libstdc++/65480,
PR libstdc++/68735, PR libstdc++/91997.
* Fix PR target/97528, taken from the gcc-10 branch.
* PR sanitizer/98699: Don't enable --as-needed with -fsanitize=* options.
* Use --push-state/--pop-state for gold everywhere.
* Explicitly use autoconf2.69 when available.
[dgit import unpatched gcc-9 9.3.0-21]