[llvm] [SLP] Enable full non-power-of-2 vectorization by default (PR #196825)

[Nikita Popov via llvm-commits]

nikic wrote:

Compile-time: https://llvm-compile-time-tracker.com/compare.php?from=2893aa5d1f31d62a8f1c50e202d7924004792f2b&to=446e03eb35105ba6a5dd72b61c4fa680e20a1139&stat=instructions:u

https://github.com/llvm/llvm-project/pull/196825