[llvm] [SLP]Initial non-power-of-2 (but still whole register) for remaining nodes (PR #113356)

[Jinsong Ji via llvm-commits]

jsji wrote:

Looks like this might be causing an assert "Assertion `VL.size() % NumParts == 0 && "Number of scalars must be divisible by NumParts.""

https://godbolt.org/z/z3b3K77E8

https://github.com/llvm/llvm-project/pull/113356