[llvm] [SLP] Prefer to trim equal-cost alternate-shuffle subtrees (PR #188272)

[Ryan Buchner via llvm-commits]

bababuck wrote:

> There is a known problem with the cost model - modelling of the fractional costs. The problem here is caused mostly by this issue - we cannot model the costing precisely in some corner cases

Hopefully fixed soon, see #178962

https://github.com/llvm/llvm-project/pull/188272