[Bug target/99531] [9/10/11/12 Regression] Performance regression since gcc 9 (argument passing / register allocation)

[vmakarov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99531

--- Comment #4 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
  Thank you for reporting this.  It is true my patch caused this.

  I've reproduced the bug on master too.  I will be working on this PR.  I
think a fix will be ready on the next week the best as the fix will touch cost
calculations and will require a lot of testing on different targets.