[llvm] [SLP] Do not skip tiny trees with gathered loads to vectorize (PR #190040)

[via llvm-commits]

Andarwinux wrote:

I can confirm [c2f97c591753b821318092c974efe57ed92f4181 ](https://github.com/llvm/llvm-project/commit/c2f97c591753b821318092c974efe57ed92f4181) fixed the problem.

https://github.com/llvm/llvm-project/pull/190040