[llvm] [RISCV] Support llvm.masked.expandload intrinsic (PR #101954)

[Pengcheng Wang via llvm-commits]

================

----------------
wangpc-pp wrote:

I think so, but there are more works to be done(see https://github.com/llvm/llvm-project/pull/83457#discussion_r1521920346).

https://github.com/llvm/llvm-project/pull/101954