[RISCV] Use gorciw for i32 orc.b intrinsic when Zbp is enabled.
The W version of orc.b does not exist in Zbp so we need to use
gorci encoding. If we have Zbp, we can use gorciw which can avoid a
sext.w in some cases.
craig.topper on Apr 4 2021, 3:40 PM.Authored by