[turbofan] Fix ControlFlowOptimizer to also handle non-control nodes in the control chain.

test/unittests/compiler/control-flow-optimizer-unittest.cc

Index: test/unittests/compiler/control-flow-optimizer-unittest.cc
diff --git a/test/unittests/compiler/control-flow-optimizer-unittest.cc b/test/unittests/compiler/control-flow-optimizer-unittest.cc
index f5c182934ba08ec5d481928c93d8dd0622125622..f300d07767c6e6c205f24b4bb7fe3402edb170ea 100644
--- a/test/unittests/compiler/control-flow-optimizer-unittest.cc
+++ b/test/unittests/compiler/control-flow-optimizer-unittest.cc
@@ -21,25 +21,32 @@ namespace compiler {
 class ControlFlowOptimizerTest : public GraphTest {
  public:
   explicit ControlFlowOptimizerTest(int num_parameters = 3)
-      : GraphTest(num_parameters), machine_(zone()) {}
+      : GraphTest(num_parameters),
+        machine_(zone()),
+        javascript_(zone()),
+        jsgraph_(isolate(), graph(), common(), javascript(), machine()) {}
   ~ControlFlowOptimizerTest() OVERRIDE {}
 
  protected:
   void Optimize() {
-    JSOperatorBuilder javascript(zone());
-    JSGraph jsgraph(isolate(), graph(), common(), &javascript, machine());
-    ControlFlowOptimizer optimizer(&jsgraph, zone());
+    ControlFlowOptimizer optimizer(jsgraph(), zone());
     optimizer.Optimize();
   }
 
+  Node* EmptyFrameState() { return jsgraph()->EmptyFrameState(); }
+
+  JSGraph* jsgraph() { return &jsgraph_; }
+  JSOperatorBuilder* javascript() { return &javascript_; }
   MachineOperatorBuilder* machine() { return &machine_; }
 
  private:
   MachineOperatorBuilder machine_;
+  JSOperatorBuilder javascript_;
+  JSGraph jsgraph_;
 };
 
 
-TEST_F(ControlFlowOptimizerTest, BuildSwitch) {
+TEST_F(ControlFlowOptimizerTest, BuildSwitch1) {
   Node* index = Parameter(0);
   Node* branch0 = graph()->NewNode(
       common()->Branch(),
@@ -66,6 +73,41 @@ TEST_F(ControlFlowOptimizerTest, BuildSwitch) {
 }
 
 
+TEST_F(ControlFlowOptimizerTest, BuildSwitch2) {
+  Node* input = Parameter(0);
+  Node* context = Parameter(1);
+  Node* index = FLAG_turbo_deoptimization
+                    ? graph()->NewNode(javascript()->ToNumber(), input, context,
+                                       EmptyFrameState(), start(), start())
+                    : graph()->NewNode(javascript()->ToNumber(), input, context,
+                                       start(), start());
+  Node* if_success = graph()->NewNode(common()->IfSuccess(), index);
+  Node* branch0 = graph()->NewNode(
+      common()->Branch(),
+      graph()->NewNode(machine()->Word32Equal(), index, Int32Constant(0)),
+      if_success);
+  Node* if_true0 = graph()->NewNode(common()->IfTrue(), branch0);
+  Node* if_false0 = graph()->NewNode(common()->IfFalse(), branch0);
+  Node* branch1 = graph()->NewNode(
+      common()->Branch(),
+      graph()->NewNode(machine()->Word32Equal(), index, Int32Constant(1)),
+      if_false0);
+  Node* if_true1 = graph()->NewNode(common()->IfTrue(), branch1);
+  Node* if_false1 = graph()->NewNode(common()->IfFalse(), branch1);
+  Node* merge =
+      graph()->NewNode(common()->Merge(3), if_true0, if_true1, if_false1);
+  graph()->SetEnd(graph()->NewNode(common()->End(), merge));
+  Optimize();
+  Capture<Node*> switch_capture;
+  EXPECT_THAT(
+      end(),
+      IsEnd(IsMerge(IsIfValue(0, CaptureEq(&switch_capture)),
+                    IsIfValue(1, CaptureEq(&switch_capture)),
+                    IsIfDefault(AllOf(CaptureEq(&switch_capture),
+                                      IsSwitch(index, IsIfSuccess(index)))))));
+}
+
+
 TEST_F(ControlFlowOptimizerTest, CloneBranch) {
   Node* cond0 = Parameter(0);
   Node* cond1 = Parameter(1);