[llvm] [SLP]Initial support for non-power-of-2 (but still whole register) number of elements in operands. (PR #107273)

[Nikita Popov via llvm-commits]

nikic wrote:

This causes a crash when linking lencod from llvm-test-suite in ReleaseThinLTO configuration. Reverted for now in https://github.com/llvm/llvm-project/commit/29b92d07746fac26cd64c914bc9c5c3833974f6d.

https://github.com/llvm/llvm-project/pull/107273