[Bug rtl-optimization/90174] Bad register spill due to top-down allocation order

[fxue at os dot amperecomputing.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90174

--- Comment #6 from Feng Xue <fxue at os dot amperecomputing.com> ---
Created attachment 46292
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46292&action=edit
test case with less live ranges