[Bug tree-optimization/90020] [7/8/9 regression] -O2 -Os x86-64 wrong code generated for GNU Emacs

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90020

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
I bisected GCC 4.9.x branch and it started with r215059, which is a backport of
3 patches. I reverted changes in:
patching file gcc/recog.c
patching file gcc/tree-ssa-loop-niter.c
patching file gcc/tree-vect-slp.c

and so that it points to backport of PR61672.