[Bug target/78639] Power9 bad code generation for cactusADM benchmark

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78639

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 40221
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40221&action=edit
Proposed patch to fix the problem