PR middle-end/98266 - bogus array subscript is partly outside array bounds on virtual...

PR middle-end/98266 - bogus array subscript is partly outside array bounds on virtual inheritance

gcc/ChangeLog:

	PR middle-end/98266
	* gimple-array-bounds.cc (inbounds_vbase_memaccess_p): New function.
	(array_bounds_checker::check_array_bounds): Call it.

gcc/testsuite/ChangeLog:

	PR middle-end/98266
	* g++.dg/warn/Warray-bounds-15.C: New test.
	* g++.dg/warn/Warray-bounds-18.C: New test.
	* g++.dg/warn/Warray-bounds-19.C: New test.
	* g++.dg/warn/Warray-bounds-20.C: New test.
	* g++.dg/warn/Warray-bounds-21.C: New test.