[Bug rtl-optimization/63718] [5 Regression] ARM Thumb1 bootstrap fail after fuse-caller-save info in cprop-hardreg

[joey.ye at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63718

--- Comment #14 from Joey Ye <joey.ye at arm dot com> ---
Em. Probably a more favorable solution is fix expand_epilogue to precisely
elaborate the side effect?