Vector ICs: Introduce an InstanceType for the type feedback vector.

src/runtime/runtime-array.cc

Index: src/runtime/runtime-array.cc
diff --git a/src/runtime/runtime-array.cc b/src/runtime/runtime-array.cc
index 1617245daf3206fce4638c57e388f88c226f7f8a..d58daeaaa9677a984d034cbbd88ad428dac70a71 100644
--- a/src/runtime/runtime-array.cc
+++ b/src/runtime/runtime-array.cc
@@ -58,19 +58,26 @@ RUNTIME_FUNCTION(Runtime_SpecialArrayFunctions) {
 RUNTIME_FUNCTION(Runtime_FixedArrayGet) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
-  CONVERT_ARG_CHECKED(FixedArray, object, 0);
+  CONVERT_ARG_CHECKED(FixedArrayBase, object, 0);
   CONVERT_SMI_ARG_CHECKED(index, 1);
-  return object->get(index);
+  if (object->IsTypeFeedbackVector()) {
+    return TypeFeedbackVector::cast(object)->get(index);

[Hannes Payer (out of office), 2015/07/01 09:44:36]

The type feedback vector should actually have to separate assessors to avoid the
ugly conditionals.

+  }
+  return FixedArray::cast(object)->get(index);
 }
 
 
 RUNTIME_FUNCTION(Runtime_FixedArraySet) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 3);
-  CONVERT_ARG_CHECKED(FixedArray, object, 0);
+  CONVERT_ARG_CHECKED(FixedArrayBase, object, 0);
   CONVERT_SMI_ARG_CHECKED(index, 1);
   CONVERT_ARG_CHECKED(Object, value, 2);
-  object->set(index, value);
+  if (object->IsTypeFeedbackVector()) {
+    TypeFeedbackVector::cast(object)->set(index, value);
+  } else {
+    FixedArray::cast(object)->set(index, value);
+  }
   return isolate->heap()->undefined_value();
 }