Add a MathFloor stub generated with TurboFan

src/type-feedback-vector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
+#include "src/code-stubs.h"
 #include "src/ic/ic.h"
 #include "src/ic/ic-state.h"
 #include "src/objects.h"
 #include "src/type-feedback-vector-inl.h"
 
 namespace v8 {
 namespace internal {
 
 // static
 TypeFeedbackVector::VectorICKind TypeFeedbackVector::FromCodeKind(
@@ skipping 288 matching lines @@
   }
 
   return UNINITIALIZED;
 }
 
 
 InlineCacheState CallICNexus::StateFromFeedback() const {
   Isolate* isolate = GetIsolate();
   Object* feedback = GetFeedback();
   DCHECK(!FLAG_vector_ics ||
-         GetFeedbackExtra() == *vector()->UninitializedSentinel(isolate));
+         GetFeedbackExtra() == *vector()->UninitializedSentinel(isolate) ||
+         GetFeedbackExtra() == Smi::FromInt(kHasReturnedMinusZeroSentinel));
 
   if (feedback == *vector()->MegamorphicSentinel(isolate)) {
     return GENERIC;
   } else if (feedback->IsAllocationSite() || feedback->IsWeakCell()) {
     return MONOMORPHIC;
   }
 
   CHECK(feedback == *vector()->UninitializedSentinel(isolate));
   return UNINITIALIZED;
 }
@@ skipping 228 matching lines @@
 
 Name* KeyedLoadICNexus::FindFirstName() const {
   Object* feedback = GetFeedback();
   if (feedback->IsString()) {
     return Name::cast(feedback);
   }
   return NULL;
 }
 }
 }  // namespace v8::internal