[gcc(refs/users/rguenth/heads/vect-force-slp)] Improve combined store node splitting

https://gcc.gnu.org/g:4336060fe2db8ec41c0f108034a4ae8de89e5fa1 commit 4336060fe2db8ec41c0f108034a4ae8de89e5fa1 Author: Richard Biener Date: Wed Mar 20 14:55:08 2024 +0100 Improve combined store node splitting The following improves on the initial "Avoid splitting store dataref

[gcc(refs/users/rguenth/heads/vect-force-slp)] Improve combined store node splitting

https://gcc.gnu.org/g:3a1fe1d6d9412430435b9672f3a1967a395d191d commit 3a1fe1d6d9412430435b9672f3a1967a395d191d Author: Richard Biener Date: Wed Mar 20 14:55:08 2024 +0100 Improve combined store node splitting The following improves on the initial "Avoid splitting store dataref