[gcc(refs/users/meissner/heads/work176-vpair)] Add vector pair optimizations.

https://gcc.gnu.org/g:7e2134dab92d9032a849772f09b2b7935a8f4e62 commit 7e2134dab92d9032a849772f09b2b7935a8f4e62 Author: Michael Meissner Date: Tue Aug 20 12:57:41 2024 -0400 Add vector pair optimizations. 2024-08-20 Michael Meissner gcc/ * config/rs6000

[gcc(refs/users/meissner/heads/work176-vpair)] Add vector pair optimizations.

https://gcc.gnu.org/g:a2ecfd5d0a177a8c3cb187fafdb807e98a4b58a8 commit a2ecfd5d0a177a8c3cb187fafdb807e98a4b58a8 Author: Michael Meissner Date: Mon Aug 19 14:24:38 2024 -0400 Add vector pair optimizations. 2024-08-19 Michael Meissner gcc/ * config/rs6000