[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 #23 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It says (I added some debug)

   Insn 50(l0): point = 27
ignoring for conflicts:
(reg:SI 0 r0 [ a ])

but non_conflicting_reg_copy_p isn't called at all where it is improving
the allocation