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 --turbo-filter=*
+// Flags: --allow-natives-syntax --noalways-opt --turbo-filter=*
+
+var stubs = %GetCodeStubExportsObject();
 
 const kExtraTypeFeedbackMinusZeroSentinel = 1;
 const kFirstJSFunctionTypeFeedbackIndex = 5;
 const kFirstSlotExtraTypeFeedbackIndex = 5;
 
 (function()  {
-  var stub1 = builtins.MathFloorStub("MathFloorStub", 1);
+  var stub1 = stubs.MathFloorStub("MathFloorStub", 1);
   var tempForTypeVector = function(d) {
     return Math.round(d);
   }
   tempForTypeVector(5);
   var tv = %GetTypeFeedbackVector(tempForTypeVector);
   var floorFunc1 = function(v, first) {
     if (first) return;
     return stub1(stub1, kFirstSlotExtraTypeFeedbackIndex - 1, tv, undefined, v);
   };
   %OptimizeFunctionOnNextCall(stub1);
   floorFunc1(5, true);
   %FixedArraySet(tv, kFirstSlotExtraTypeFeedbackIndex - 1, stub1);
   assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
              %FixedArrayGet(tv, kFirstSlotExtraTypeFeedbackIndex));
   assertEquals(5.0, floorFunc1(5.5));
   assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
              %FixedArrayGet(tv, kFirstSlotExtraTypeFeedbackIndex));
   // Executing floor such that it returns -0 should set the proper sentinel in
   // the feedback vector.
   assertEquals(-Infinity, 1/floorFunc1(-0));
   assertEquals(kExtraTypeFeedbackMinusZeroSentinel,
                %FixedArrayGet(tv, kFirstSlotExtraTypeFeedbackIndex));
   %ClearFunctionTypeFeedback(floorFunc1);
 })();