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User is experiencing the issue in upstream bug report
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99074
[gcc 8 and above is crashing with dynamic_cast<>() on null pointer with optimization level -O1 and above]
and would like a backport for gcc-toolset-9-gcc-9.2* as it is being used
for their product.

While it is agreed it is UB, previous source code relied on this working.

Like <https://bugzilla.redhat.com/show_bug.cgi?id=2211507#c1>, except that GTS 9 is not supported anymore.

Reopening.  Since I'm updating RHEL 8 gcc for a different BZ, I might as well squeeze in this trivial fix.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (gcc bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2023:7099