[Bug bootstrap/88714] [9 regression] bootstrap comparison failure on armv7l since r265398

[matmal01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88714

--- Comment #34 from Matthew Malcomson <matmal01 at gcc dot gnu.org> ---
Yes, I needed to redo that check for an offset of 4 -- I compared the
expression of the first MEM with the result of `plus_constant` with 4 on the
expression of the second MEM in the condition.