81691d23cd
This patch contains two parts. 1. Update costs reflect to the codegen changes. This is not that accurate since the step vector can use smaller type if there is a vscale_range attribute. But we cannot get that in the type-based query in TTI. 2. Return invalid cost for the vector.extract.last.active that needs vector split for the step vector. But currently this is not handled correctly and will hit the assertion. For not blocking the FindLast reduction in LV (https://github.com/llvm/llvm-project/pull/184931). We should land this first and fix the SelectionDAG for vector.extract.last.active lowering.