[CostModel] Move default expand cost for partial reductions to BasicTTIImpl (#189905) This is a follow-up of the suggestion left here: https://github.com/llvm/llvm-project/pull/181707#discussion_r2995733831 The override functions in AMDGPU/ARM/SystemZ/X86 are required to avoid enabling partial reductions where they were previously disabled (I've added this for all targets that implement getArithmeticReductionCost).
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