[Bug tree-optimization/93868] [10 Regression] wrong-code with permuted SLP reduction

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93868

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
What's more we cannot modify the SLP nodes stmt order since they are cached in
the SLP node cache.  So a "simple" fix might be to COW the whole SLP sub-tree
we re-arrange...