Method resolve_vreg_alias

cranelift/codegen/src/machinst/vcode.rs:1796–1810

(&self, mut vreg: regalloc2::VReg)

    }

    fn resolve_vreg_alias(&self, mut vreg: regalloc2::VReg) -> regalloc2::VReg {
        // We prevent cycles from existing by resolving targets of
        // aliases eagerly before setting them. If the target resolves
        // to the origin of the alias, then a cycle would be created
        // and the alias is disallowed. Because of the structure of
        // SSA code (one instruction can refer to another's defs but
        // not vice-versa, except indirectly through
        // phis/blockparams), cycles should not occur as we use
        // aliases to redirect vregs to the temps that actually define
        // them.
        while let Some(to) = self.vreg_aliases.get(&vreg) {
            vreg = *to;
        }
        vreg
    }

    #[inline]
    fn debug_assert_no_vreg_aliases(&self, mut list: impl Iterator<Item = VReg>) {