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

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

Index: test/mjsunit/compiler/stubs/floor-stub.js
diff --git a/test/mjsunit/compiler/stubs/floor-stub.js b/test/mjsunit/compiler/stubs/floor-stub.js
index e3fc9b6003f6c1f8b59f565fe1a5b74f9f2c4d2a..2b2326a764c621bca01e571a200c4997d95eda2d 100644
--- a/test/mjsunit/compiler/stubs/floor-stub.js
+++ b/test/mjsunit/compiler/stubs/floor-stub.js
@@ -25,7 +25,9 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// 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;
@@ -36,7 +38,7 @@ const kFirstSlotExtraTypeFeedbackIndex = 5;
   }
   // 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));