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

test/mjsunit/call-counts.js

Index: test/mjsunit/call-counts.js
diff --git a/test/mjsunit/call-counts.js b/test/mjsunit/call-counts.js
index 628d2251e2b0210b507370fc61675b4afa234e1c..e2acc08de1ee2b8479998666849cdd9553d6e879 100644
--- a/test/mjsunit/call-counts.js
+++ b/test/mjsunit/call-counts.js
@@ -12,7 +12,7 @@ const kArrayCallExtraIndex = 9;
 function GetCallCount(func, slot) {
   var vector = %GetTypeFeedbackVector(func);
   // Call counts are recorded doubled.
-  var value = %FixedArrayGet(vector, slot);
+  var value = %FeedbackVectorGet(vector, slot);
   return Math.floor(value / 2);
 }