[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);

[Michael Starzinger, 2014/11/05 10:52:23]

As discussed offline: This test isn't particularly useful, because these blocks
form a chain and almost all of them will end up being deferred. Maybe we should
revert this line and add one specific test case that tests the propagation of
the "deferredness" explicitly.

       schedule.AddGoto(last, block);
       last = block;
     }