[llvm] [RISCV] Don't look for sext in RISCVCodeGenPrepare::visitAnd. (PR #78798)

[Nikita Popov via llvm-commits]

nikic wrote:

(An alternative would be to check that the constant isInt<31> I think. But your approach seems preferable.)

https://github.com/llvm/llvm-project/pull/78798