[llvm] [RISCV] Emit VP strided loads/stores in RISCVGatherScatterLowering (PR #98111)

[Craig Topper via llvm-commits]

topperc wrote:

> On second thought though this does remove the @llvm.riscv.masked.strided.load and @llvm.riscv.masked.strided.store intrinsics which is breaking. Maybe there's an argument for backporting so we don't have people using them between now and LLVM 20

If you believe that somebody external is going to use them or is using them, then we should add AutoUpgrade.cpp support for upgrading them. Independent of whether we backport or not.

https://github.com/llvm/llvm-project/pull/98111