[Bug rtl-optimization/85941] Zero extend from QI->SI lost if QI is referred to via subreg:HI

[jozef.l at mittosystems dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85941

--- Comment #1 from Jozef Lawrynowicz <jozef.l at mittosystems dot com> ---
Created attachment 44191
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44191&action=edit
incorrect assembly output