[RISCV] Add isel patterns for ineg+setge/le/uge/ule.

setge/le/uge/ule selected by themselves require an xori with 1.
If we're negating the setcc, we can fold the xori with the neg
to create an addi with -1.

This works because xori X, 1 is equivalent to 1 - X if X is either
0 or 1. So we're doing -(1 - X) which is X-1 or X+-1.

This improves the code for selecting between 0 and -1 based on a
condition for some conditions.

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D129957