[llvm] [X86] Prefer 128-bit vectors for Bulldozer CPUs (PR #225838)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

Test changes look good now thank you.

Please can you add a entry to the x86 section in llvm\docs\ReleaseNotes.md?

@ganeshgit Please can we get some perf numbers?

https://github.com/llvm/llvm-project/pull/225838