[Bug target/78002] gcc.target/aarch64/stack-checking.c ICEs with -mabi=ilp32

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78002

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
So the proper thing to do might be to restore Pmode as in the first version:
  https://gcc.gnu.org/ml/gcc-patches/2015-11/msg01988.html