Add a fold_redundant_jumps() pass to the branch relaxation phase. (#887)

cranelift/codegen/src/context.rs

@@ -329,7 +329,7 @@ impl Context {
     /// Run the branch relaxation pass and return information about the function's code and
     /// read-only data.
     pub fn relax_branches(&mut self, isa: &dyn TargetIsa) -> CodegenResult<CodeInfo> {
-        let info = relax_branches(&mut self.func, isa)?;
+        let info = relax_branches(&mut self.func, &mut self.cfg, &mut self.domtree, isa)?;
         self.verify_if(isa)?;
         self.verify_locations_if(isa)?;
         Ok(info)