[TurboFan] Improve Array constructor optimization

test/mjsunit/array-constructor-feedback.js

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 // Flags: --allow-natives-syntax --expose-gc
+// Flags: --noalways-opt
 
 // Test element kind of objects.
 
 var elements_kind = {
   fast_smi_only            :  'fast smi only elements',
   fast                     :  'fast elements',
   fast_double              :  'fast double elements',
   dictionary               :  'dictionary elements',
   external_byte            :  'external byte elements',
   external_unsigned_byte   :  'external unsigned byte elements',
@@ skipping 15 matching lines @@
 
 function isHoley(obj) {
   if (%HasFastHoleyElements(obj)) return true;
   return false;
 }
 
 function assertKind(expected, obj, name_opt) {
   assertEquals(expected, getKind(obj), name_opt);
 }
 
-// Test: If a call site goes megamorphic, it retains the ability to
-// use allocation site feedback (if FLAG_allocation_site_pretenuring
-// is on).
-(function() {
-  function bar(t, len) {
-    return new t(len);
-  }
-
-  a = bar(Array, 10);
-  a[0] = 3.5;
-  b = bar(Array, 1);
-  assertKind(elements_kind.fast_double, b);
-  c = bar(Object, 3);
-  b = bar(Array, 10);
-  // TODO(mvstanton): re-enable when FLAG_allocation_site_pretenuring
-  // is on in the build.
-  // assertKind(elements_kind.fast_double, b);
-})();
-
-
 // Test: ensure that crankshafted array constructor sites are deopted
 // if another function is used.
 (function() {
   function bar0(t) {
     return new t();
   }
   a = bar0(Array);
   a[0] = 3.5;
   b = bar0(Array);
   assertKind(elements_kind.fast_double, b);
@@ skipping 133 matching lines @@
   bar(size)[0] = 'string';
   var res = bar(size);
   assertKind(elements_kind.fast, bar(size));
     %OptimizeFunctionOnNextCall(bar);
   assertKind(elements_kind.fast, bar(size));
   // But there is a limit, based on the size of the old generation, currently
   // 22937600, but double it to prevent the test being too brittle.
   var large_size = 22937600 * 2;
   assertKind(elements_kind.dictionary, bar(large_size));
 })();