[RISCV] Add swapped patterns to VPatIntegerSetCCVL_VIPlus1.

This matches VPatIntegerSetCCVL_VI_Swappable. But as noted in the
FIXME this may only be needed due to lack of canonicalization on
VP_SETCC.

Reviewed By: rogfer01

Differential Revision: https://reviews.llvm.org/D123239