[gcc(refs/users/meissner/heads/work179-vpair)] Rewrite vector-pair.h to use macros.

https://gcc.gnu.org/g:19ed2c59d89de89c3c4473325636d8778137712e commit 19ed2c59d89de89c3c4473325636d8778137712e Author: Michael Meissner Date: Tue Oct 1 23:15:16 2024 -0400 Rewrite vector-pair.h to use macros. 2024-10-01 Michael Meissner * config/rs6000/rs6000-c

[gcc(refs/users/meissner/heads/work179-vpair)] Rewrite vector-pair.h.

https://gcc.gnu.org/g:b5dc5d0e1843ec1bb40270b684e161a06359b6a8 commit b5dc5d0e1843ec1bb40270b684e161a06359b6a8 Author: Michael Meissner Date: Mon Sep 30 13:25:21 2024 -0400 Rewrite vector-pair.h. 2024-09-30 Michael Meissner gcc/ * config/rs6000/vector-