Use explicit type feedback clearing in some tests.

test/mjsunit/compiler/alloc-object.js

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-// Flags: --allow-natives-syntax --expose-gc --inline-construct
+// Flags: --allow-natives-syntax --inline-construct
 
 // Test that inlined object allocation works for different layouts of
 // objects (e.g. in object properties, slack tracking in progress or
 // changing of function prototypes)
 
 function test_helper(construct, a, b) {
   return new construct(a, b);
 }
 
 function test(construct) {
   %DeoptimizeFunction(test);
   test_helper(construct, 0, 0);
   test_helper(construct, 0, 0);
   %OptimizeFunctionOnNextCall(test_helper);
   // Test adding a new property after allocation was inlined.
   var o = test_helper(construct, 1, 2);
   o.z = 3;
   assertEquals(1, o.x);
   assertEquals(2, o.y);
   assertEquals(3, o.z);
   // Test changing the prototype after allocation was inlined.
   construct.prototype = { z:6 };
   var o = test_helper(construct, 4, 5);
   assertEquals(4, o.x);
   assertEquals(5, o.y);
   assertEquals(6, o.z);
   %DeoptimizeFunction(test_helper);
-  gc();  // Makes V8 forget about type information for test_helper.
+  %ClearFunctionTypeFeedback(test_helper);
 }
 
 function finalize_slack_tracking(construct) {
   // Value chosen based on kGenerousAllocationCount = 8.
   for (var i = 0; i < 8; i++) {
     new construct(0, 0);
   }
 }
 
 
@@ skipping 14 matching lines @@
 finalize_slack_tracking(ConstructInObjectUnused);
 test(ConstructInObjectUnused);
 
 
 // Test inlined allocation while slack tracking is still in progress.
 function ConstructWhileSlackTracking(a, b) {
   this.x = a;
   this.y = b;
 }
 test(ConstructWhileSlackTracking);