[turbofan] Propagate "deferredness" to dominated basic blocks.

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 3a0103d8ac7749fe70e9364fb402e627007c859d..5f5c9d190a0899f145d8feee5aa28e59df3f50c3 100644
--- a/test/cctest/compiler/test-scheduler.cc
+++ b/test/cctest/compiler/test-scheduler.cc
@@ -34,6 +34,17 @@ static void CheckRPONumbers(BasicBlockVector* order, size_t expected,
       CHECK_EQ(NULL, order->at(i)->loop_header());
     }
   }
+  int number = 0;
+  for (auto const block : *order) {
+    if (block->deferred()) continue;
+    CHECK_EQ(number, block->ao_number());
+    ++number;
+  }
+  for (auto const block : *order) {
+    if (!block->deferred()) continue;
+    CHECK_EQ(number, block->ao_number());
+    ++number;
+  }
 }
 
 
@@ -155,6 +166,7 @@ TEST(RPOLine) {
     BasicBlock* last = schedule.start();
     for (int j = 0; j < i; j++) {
       BasicBlock* block = schedule.NewBasicBlock();
+      block->set_deferred(i & 1);
       schedule.AddGoto(last, block);
       last = block;
     }