Revert of [compiler] Properly guard the speculative optimizations for instanceof.

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 5ed03f8101418ad3333be162018369ab3fd888eb..a7429d050c8ef4e1de0174112cec5f1137cfcdbc 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -2929,67 +2929,6 @@
   // TODO(bmeurer): Use GetPropertyStub here once available.
   assembler->Bind(&return_runtime);
   {
-    result.Bind(assembler->CallRuntime(Runtime::kInstanceOf, context, object,
-                                       callable));
-    assembler->Goto(&end);
-  }
-
-  assembler->Bind(&end);
-  return result.value();
-}
-
-// static
-compiler::Node* InstanceOfWithFeedbackStub::Generate(
-    CodeStubAssembler* assembler, compiler::Node* object,
-    compiler::Node* callable, compiler::Node* slot_id,
-    compiler::Node* type_feedback_vector, compiler::Node* context) {
-  // TODO(bmeurer): Unify this with the InstanceOfStub above. This
-  // stub itself can be removed once we get rid of fullcodegen.
-  typedef CodeStubAssembler::Label Label;
-  typedef compiler::Node Node;
-  typedef CodeStubAssembler::Variable Variable;
-
-  Label return_runtime(assembler, Label::kDeferred), end(assembler);
-  Variable result(assembler, MachineRepresentation::kTagged);
-
-  // Check if no one installed @@hasInstance somewhere.
-  assembler->GotoUnless(
-      assembler->WordEqual(
-          assembler->LoadObjectField(
-              assembler->LoadRoot(Heap::kHasInstanceProtectorRootIndex),
-              PropertyCell::kValueOffset),
-          assembler->SmiConstant(Smi::FromInt(Isolate::kArrayProtectorValid))),
-      &return_runtime);
-
-  // Check if {callable} is a valid receiver.
-  assembler->GotoIf(assembler->WordIsSmi(callable), &return_runtime);
-  assembler->GotoIf(
-      assembler->Word32Equal(
-          assembler->Word32And(
-              assembler->LoadMapBitField(assembler->LoadMap(callable)),
-              assembler->Int32Constant(1 << Map::kIsCallable)),
-          assembler->Int32Constant(0)),
-      &return_runtime);
-
-  // Use the inline OrdinaryHasInstance directly.
-  CodeStubAssembler::VectorSlotPair feedback(type_feedback_vector, slot_id);
-  result.Bind(
-      assembler->OrdinaryHasInstance(context, callable, object, feedback));
-  assembler->Goto(&end);
-
-  assembler->Bind(&return_runtime);
-  {
-    // Record megamorphic here; we use this feedback to guard a bunch of
-    // speculative optimizations in TurboFand (and Crankshaft) that just
-    // deoptimize in case of funny inputs to instanceof.
-    Node* megamorphic_sentinel = assembler->HeapConstant(
-        TypeFeedbackVector::MegamorphicSentinel(assembler->isolate()));
-    assembler->StoreFixedArrayElement(type_feedback_vector, slot_id,
-                                      megamorphic_sentinel, SKIP_WRITE_BARRIER);
-
-    // Fallback to the %InstanceOf runtime implementation for now, which
-    // can deal with @@hasInstance and friends.
-    // TODO(bmeurer): Use GetPropertyStub here once available.
     result.Bind(assembler->CallRuntime(Runtime::kInstanceOf, context, object,
                                        callable));
     assembler->Goto(&end);