[Bug rtl-optimization/92176] LRA problem with reloads for subreg operands

[krebbel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92176

--- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Created attachment 47388
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47388&action=edit
Experimental patch

This patch fixes the second testcase. The first one currently doesn't fail on
head.