[VecOps][NFC] Rename RVEC_NODISCARD to R__RVEC_NODISCARD
[VecOps][NFC] Rename RVEC_NODISCARD to R__RVEC_NODISCARD

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root