[turbofan] Properly optimize instanceof (even in the presence of @@hasInstance).

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 6cd0cc8e68cffde5a79b59cd3947cab8cc59aed0..6883052abbf533c4bdc781a3d86c5c7bc16f23e7 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -860,43 +860,6 @@ TEST_F(JSTypedLoweringTest, JSSubtractSmis) {
 }
 
 // -----------------------------------------------------------------------------
-// JSInstanceOf
-// Test that instanceOf is reduced if and only if the right-hand side is a
-// function constant. Functional correctness is ensured elsewhere.
-
-TEST_F(JSTypedLoweringTest, JSInstanceOfSpecialization) {
-  Node* const context = Parameter(Type::Any());
-  Node* const frame_state = EmptyFrameState();
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-
-  Node* instanceOf =
-      graph()->NewNode(javascript()->InstanceOf(), Parameter(Type::Any(), 0),
-                       HeapConstant(isolate()->object_function()), context,
-                       frame_state, effect, control);
-  Reduction r = Reduce(instanceOf);
-  ASSERT_TRUE(r.Changed());
-}
-
-
-TEST_F(JSTypedLoweringTest, JSInstanceOfNoSpecialization) {
-  Node* const context = Parameter(Type::Any());
-  Node* const frame_state = EmptyFrameState();
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-
-  // Do not reduce if right-hand side is not a function constant.
-  Node* instanceOf = graph()->NewNode(
-      javascript()->InstanceOf(), Parameter(Type::Any(), 0),
-      Parameter(Type::Any()), context, frame_state, effect, control);
-  Node* dummy = graph()->NewNode(javascript()->ToObject(), instanceOf, context,
-                                 frame_state, effect, control);
-  Reduction r = Reduce(instanceOf);
-  ASSERT_FALSE(r.Changed());
-  ASSERT_EQ(instanceOf, dummy->InputAt(0));
-}
-
-// -----------------------------------------------------------------------------
 // JSBitwiseAnd
 
 TEST_F(JSTypedLoweringTest, JSBitwiseAndWithSignedSmallHint) {