[Bug rtl-optimization/83147] LRA inheritance undo on multiple sets problem

[krebbel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83147

--- Comment #1 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Created attachment 42714
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42714&action=edit
Experimental patch

This patch appears to fix the problem for me. However, it isn't really tested
yet.