To follow-up ona06be8a(SLP/RISCV: add negative test for lrint), add a negative test for llvm.llrint as well, and increase the coverage to cover vectors of length 2, 4, and 8, and the i32 variant of lrint, in preparation to get SLPVectorizer to vectorize both lrint and llrint. This is now possible with the recent change98c90a1(ISel: introduce vector ISD::LRINT, ISD::LLRINT; custom RISCV lowering).