Scheduler checks that end block doesn't have successors.

test/cctest/compiler/test-scheduler.cc

Index: test/cctest/compiler/test-scheduler.cc
diff --git a/test/cctest/compiler/test-scheduler.cc b/test/cctest/compiler/test-scheduler.cc
index f835265201eb704b012abf761d99d453eaac9e85..447422d121ac249799ac1879b2d4bd111e75dbfa 100644
--- a/test/cctest/compiler/test-scheduler.cc
+++ b/test/cctest/compiler/test-scheduler.cc
@@ -203,12 +203,13 @@ TEST(RPOSelfLoop) {
 TEST(RPOEntryLoop) {
   HandleAndZoneScope scope;
   Schedule schedule(scope.main_zone());
-  schedule.AddSuccessorForTesting(schedule.start(), schedule.end());
-  schedule.AddSuccessorForTesting(schedule.end(), schedule.start());
+  BasicBlock* body = schedule.NewBasicBlock();
+  schedule.AddSuccessorForTesting(schedule.start(), body);
+  schedule.AddSuccessorForTesting(body, schedule.start());
   ZonePool zone_pool(scope.main_isolate());
   BasicBlockVector* order = Scheduler::ComputeSpecialRPO(&zone_pool, &schedule);
   CheckRPONumbers(order, 2, true);
-  BasicBlock* loop[] = {schedule.start(), schedule.end()};
+  BasicBlock* loop[] = {schedule.start(), body};
   CheckLoop(order, loop, 2);
 }
 
@@ -656,7 +657,7 @@ TEST(RPOLoopMultibackedge) {
   BasicBlock* A = schedule.start();
   BasicBlock* B = schedule.NewBasicBlock();
   BasicBlock* C = schedule.NewBasicBlock();
-  BasicBlock* D = schedule.end();
+  BasicBlock* D = schedule.NewBasicBlock();
   BasicBlock* E = schedule.NewBasicBlock();
 
   schedule.AddSuccessorForTesting(A, B);