[RISCV] Enable preferZeroCompareBranch to optimize branch on zero in codegenprepare

Similar to ARM and SystemZ.

Related Patchs: D101778(preferZeroCompareBranch)
https://reviews.llvm.org/rG9a9421a461166482465e786a46f8cced63cd2e9f   ( == 0 to u< 1）

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D142071