[Bug target/100840] ICE with -O1: in replace_reg, at reg-stack.c:714

[cnsun at uwaterloo dot ca via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100840

--- Comment #4 from Chengnian Sun <cnsun at uwaterloo dot ca> ---
Hi Andrew,

GCC does not crash on the test program in PR69899. 

For the program in this PR, GCC does not crash at -O0, but from -O1.