[Bug other/105729] False positive UBsan "reference binding to null pointer of type" when evaluating array indexing which throws exception

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105729

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think the problem is that fold_unary optimizes
conversion of (const struct Bar *) ((const struct Foo *) this)->data +
(sizetype) range_check (x)
to const struct Bar &
type into conversion of the lhs of the POINTER_PLUS_EXPR
to const struct Bar & type followed by POINTER_PLUS_EXPR.