[Bug target/70903] [4.9/5/6/7 Regression] wrong code with bfi @ aarch64 with -Os

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70903

--- Comment #2 from ktkachov at gcc dot gnu.org ---
-fno-rerun-cse-after-loop "fixes" the tescase. cse2 is where it starts to go
wrong