The C++ reproducer for PR analyzer/94028 generates a similar ICE
to that of the Fortran reproducer for PR analyzer/93993 and, like
it, was fixed by r10-7023-g3d66e153.

This patch adds the C++ reproducer as a regression test.

gcc/testsuite/ChangeLog:
	PR analyzer/94028
	* g++.dg/analyzer/pr94028.C: New test.