[Bug tree-optimization/97201] [11 Regression] ICE in location_wrapper_p at gcc/gcc/tree.h:4002 since r11-3410-g67aeddb785ddcc86

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97201

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
The decision to use null for the upper bound can be traced to this message:
https://gcc.gnu.org/pipermail/gcc-patches/2015-December/437361.html