Remove duplication in Scheduler and simplify interface. Make ComputeSchedule() and ComputeSpecialRP…

test/cctest/compiler/test-instruction.cc

Index: test/cctest/compiler/test-instruction.cc
diff --git a/test/cctest/compiler/test-instruction.cc b/test/cctest/compiler/test-instruction.cc
index ea560eebfd53efc6c35a04e61fb84f22769e9709..ef44b310098862592f3a6170e8646ef50e057ed4 100644
--- a/test/cctest/compiler/test-instruction.cc
+++ b/test/cctest/compiler/test-instruction.cc
@@ -51,8 +51,7 @@ class InstructionTester : public HandleAndZoneScope {
   void allocCode() {
     if (schedule.rpo_order()->size() == 0) {
       // Compute the RPO order.
-      Scheduler scheduler(zone(), &graph, &schedule);
-      scheduler.ComputeSpecialRPO();
+      Scheduler::ComputeSpecialRPO(&schedule);
       DCHECK(schedule.rpo_order()->size() > 0);
     }
     code = new TestInstrSeq(&linkage, &graph, &schedule);