[Bug middle-end/81818] aarch64 uses 2-3x memory and 2x time of arm at -Os, -O2, -O3

[andrewm.roberts at sky dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81818

--- Comment #7 from Andrew Roberts <andrewm.roberts at sky dot com> ---
I'll try the memory testing on both arm and aarch64.

I've also tried -fopt-info-all-optall, I was hoping this would provide some
info on what was happening, but it only seems to give any output under -O3.