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

test/unittests/compiler/node-test-utils.cc

Index: test/unittests/compiler/node-test-utils.cc
diff --git a/test/unittests/compiler/node-test-utils.cc b/test/unittests/compiler/node-test-utils.cc
index eccc96227e4e0d4fbb1bd4f6e867d6d23a3a5563..72723145851c394836d4ca46fee19f00ec9df624 100644
--- a/test/unittests/compiler/node-test-utils.cc
+++ b/test/unittests/compiler/node-test-utils.cc
@@ -1303,6 +1303,12 @@ Matcher<Node*> IsIfFalse(const Matcher<Node*>& control_matcher) {
 }
 
 
+Matcher<Node*> IsIfSuccess(const Matcher<Node*>& control_matcher) {
+  return MakeMatcher(
+      new IsControl1Matcher(IrOpcode::kIfSuccess, control_matcher));
+}
+
+
 Matcher<Node*> IsSwitch(const Matcher<Node*>& value_matcher,
                         const Matcher<Node*>& control_matcher) {
   return MakeMatcher(new IsSwitchMatcher(value_matcher, control_matcher));