[Bug tree-optimization/87176] [9 Regression] wrong code at -Os and above on x86-64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87176

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue here is similar to that of PR87132 - this time we get at memory state
from the previous iteration by means of a virtual PHI that was value-numbered
to its backedge value.