[llvm] [RISCV][VLOPT] Add mask load to isSupported and getOperandInfo (PR #122030)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

> masked -> mask. "Masked load" would be load of a vector with some elements skipped by the mask. "Mask load" loads a memory location containing a mask.

done

https://github.com/llvm/llvm-project/pull/122030