Do not mark from native code. Check color and call incremental marker instead.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 28a3e2637cabc7f29f7af21c474b0fe402e0e28c..dfd63a6e8af90e3cbb83a030d09e6b1ff3f78e36 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -149,14 +149,10 @@ class MacroAssembler: public Assembler {
                    Label* on_black,
                    Label::Distance on_black_distance = Label::kFar);
 
-  // Checks the color of an object.  If the object is already grey or black
-  // then we just fall through, since it is already live.  If it is white and
-  // we can determine that it doesn't need to be scanned, then we just mark it
-  // black and fall through.  For the rest we jump to the label so the
-  // incremental marker can fix its assumptions.
-  void EnsureNotWhite(Register object, Register scratch1, Register scratch2,
-                      Label* object_is_white_and_not_data,
-                      Label::Distance distance);
+  // Checks the color of an object.  If the object is white we jump to the
+  // incremental marker.
+  void JumpIfWhite(Register value, Register scratch1, Register scratch2,
+                   Label* value_is_white, Label::Distance distance);
 
   // Notify the garbage collector that we wrote a pointer into an object.
   // |object| is the object being stored into, |value| is the object being