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

test/mjsunit/compiler/stubs/floor-stub.js

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 // modification, are permitted provided that the following conditions are
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 //
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@@ skipping 20 matching lines @@
 const kFirstSlotExtraTypeFeedbackIndex = 5;
 
 (function(){
   var floorFunc = function() {
     Math.floor(NaN);
   }
   // Execute the function once to make sure it has a type feedback vector.
   floorFunc(5);
   var stub = builtins.MathFloorStub("MathFloorStub", 0);
   assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
-             %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
-                            kFirstSlotExtraTypeFeedbackIndex));
+             %FeedbackVectorGet(%GetTypeFeedbackVector(floorFunc),
+                                kFirstSlotExtraTypeFeedbackIndex));
   assertEquals(5.0, stub(floorFunc, 4, 5.5));
   assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
-             %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
-                            kFirstSlotExtraTypeFeedbackIndex));
+             %FeedbackVectorGet(%GetTypeFeedbackVector(floorFunc),
+                                kFirstSlotExtraTypeFeedbackIndex));
   // Executing floor such that it returns -0 should set the proper sentinel in
   // the feedback vector.
   assertEquals(-Infinity, 1/stub(floorFunc, 4, -0));
   assertEquals(kExtraTypeFeedbackMinusZeroSentinel,
-               %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
-                              kFirstSlotExtraTypeFeedbackIndex));
+               %FeedbackVectorGet(%GetTypeFeedbackVector(floorFunc),
+                                  kFirstSlotExtraTypeFeedbackIndex));
   %ClearFunctionTypeFeedback(floorFunc);
 })();