[llvm] [X86] Add TuningSlowPDEP/PEXT flags and control vector PDEP/PEXT scalarization with them (PR #218980)

[via llvm-commits]

https://github.com/Andarwinux commented:

The pclmulqdq sequence is just too long. I think it's necessary to keep the scalarization for minsize.

https://github.com/llvm/llvm-project/pull/218980