[gcc(refs/users/meissner/heads/work173)] Use old arch code for power4-power6 part 2.

https://gcc.gnu.org/g:85a5bf5709ae03cd14f54497fa26e49cab383b1c commit 85a5bf5709ae03cd14f54497fa26e49cab383b1c Author: Michael Meissner Date: Mon Jul 29 20:30:42 2024 -0400 Use old arch code for power4-power6 part 2. 2024-07-29 Michael Meissner gcc/ *

[gcc(refs/users/meissner/heads/work173)] Use old arch code for power4-power6.

https://gcc.gnu.org/g:e4d2106c7ef57a460688cdc959a61901684ddd9d commit e4d2106c7ef57a460688cdc959a61901684ddd9d Author: Michael Meissner Date: Mon Jul 29 19:36:22 2024 -0400 Use old arch code for power4-power6. 2024-07-29 Michael Meissner gcc/ * config/