With the recent change 98c90a13 (ISel: introduce vector ISD::LRINT, ISD::LLRINT; custom RISCV lowering), it is now possible for SLPVectorizer, LoopVectorize, and Scalarizer to operate on llvm.lrint and llvm.llrint, with vector codegen for the RISC-V target. Make a trivial change to VectorUtils, and update the corresponding tests.