[llvm] [IA][RISCV] Support VP intrinsics in InterleavedAccessPass (PR #120490)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

I just stack this PR on top of #123106 so that we now only need to generate masked version of segmented load/store.

https://github.com/llvm/llvm-project/pull/120490