Create a internal, global native context used only for generated code stubs

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

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-// Flags: --allow-natives-syntax --expose-natives-as=builtins --noalways-opt
+// Flags: --allow-natives-syntax --noalways-opt
+
+var stubs = %GetCodeStubExportsObject();
 
 const kExtraTypeFeedbackMinusZeroSentinel = 1;
 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);
+  var stub = stubs.MathFloorStub("MathFloorStub", 0);
   assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
              %FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
                             kFirstSlotExtraTypeFeedbackIndex));
   assertEquals(5.0, stub(floorFunc, 4, 5.5));
   assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
              %FixedArrayGet(%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));
   %ClearFunctionTypeFeedback(floorFunc);
 })();