[Bug rtl-optimization/87871] [9 Regression] testcases fail after r265398 on arm

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87871

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The first one just needs an xfail.  I don't know if it should be *-*-* there
or only arm*-*-* should be added.

The other two need some debugging by someone who knows the target and/or
these tests.