[Bug tree-optimization/114345] FRE missing knowledge of semantics of IFN loads

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114345

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Well, the shuffling in .LOAD_LANES will be a bit awkward to do, but sure.  We
basically lack "constant folding" of .LOAD_LANES and similarly of course
we can't see through .STORE_LANES of a constant when later folding a scalar
load from the same memory.