Hydrogen code stubs for vector-based ICs.

src/type-feedback-vector.cc

Index: src/type-feedback-vector.cc
diff --git a/src/type-feedback-vector.cc b/src/type-feedback-vector.cc
index 0e78358d949df687b688bc1e9edb37883c9826f9..f9ceca4ab3c63a6986f6044bf8eb36f3dd4f5a05 100644
--- a/src/type-feedback-vector.cc
+++ b/src/type-feedback-vector.cc
@@ -98,6 +98,10 @@ Handle<TypeFeedbackVector> TypeFeedbackVector::Allocate(
   }
   array->set(kWithTypesIndex, Smi::FromInt(0));
   array->set(kGenericCountIndex, Smi::FromInt(0));
+  // Fill the indexes with zeros.
+  for (int i = 0; i < index_count; i++) {
+    array->set(kReservedIndexCount + i, Smi::FromInt(0));
+  }
 
   // Ensure we can skip the write barrier
   Handle<Object> uninitialized_sentinel = UninitializedSentinel(isolate);