[turbofan] Optimize strict equality of unique values.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index 9d713cf27bbca6df3247a34806d82db31a0bafbc..ddff92512be61d9e1ad35c0ab1afa96e68bc070f 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -436,18 +436,27 @@ TEST_F(JSTypedLoweringTest, JSToNumberWithPlainPrimitive) {
 TEST_F(JSTypedLoweringTest, JSStrictEqualWithTheHole) {
   Node* const the_hole = HeapConstant(factory()->the_hole_value());
   Node* const context = UndefinedConstant();
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
   TRACED_FOREACH(Type*, type, kJSTypes) {
     Node* const lhs = Parameter(type);
-    Reduction r = Reduce(graph()->NewNode(javascript()->StrictEqual(), lhs,
-                                          the_hole, context, effect, control));
+    Reduction r = Reduce(
+        graph()->NewNode(javascript()->StrictEqual(), lhs, the_hole, context));
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(), IsFalseConstant());
   }
 }
 
 
+TEST_F(JSTypedLoweringTest, JSStrictEqualWithUnique) {
+  Node* const lhs = Parameter(Type::Unique(), 0);
+  Node* const rhs = Parameter(Type::Unique(), 1);
+  Node* const context = Parameter(Type::Any(), 2);
+  Reduction r =
+      Reduce(graph()->NewNode(javascript()->StrictEqual(), lhs, rhs, context));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(), IsReferenceEqual(Type::Unique(), lhs, rhs));
+}
+
+
 // -----------------------------------------------------------------------------
 // JSShiftLeft