[llvm] [X86] Disable the `vpdpwssd -> vpmaddwd + vpaddd` combiner pattern on AMD Zen4 (PR #84347)

[via llvm-commits]

ganeshgit wrote:

> @bjacob Reopening this - please can you replace the "EnableVPDPWSSTPatterns" with a Tuning flag as suggested on #84182
It's on me. I will submit a patch.

https://github.com/llvm/llvm-project/pull/84347