[Bug rtl-optimization/69307] [4.9/5/6 Regression] wrong code with -O2 -fselective-scheduling @ armv7a

[abel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69307

--- Comment #6 from Andrey Belevantsev <abel at gcc dot gnu.org> ---
Created attachment 37551
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37551&action=edit
proposed patch

Here before reload we're trying to rename a hard register.  At the very final
point of choosing the new register we forget to properly check hard_regno_nregs
when checking liveness restrictions (though we did all the way to that point). 
Then we incorrectly choose the original register as it seems to be good enough.
 Fixed by looping over all registers specified in hard_regno_nregs at that
place, too.