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

src/ppc/macro-assembler-ppc.h

Index: src/ppc/macro-assembler-ppc.h
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index 007ccf68f354ef8366aeee3cc8c636896adf070e..33e59956ae5958d1b71da0f3682d76a1f47a2335 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -212,21 +212,10 @@ class MacroAssembler : public Assembler {
   void HasColor(Register object, Register scratch0, Register scratch1,
                 Label* has_color, int first_bit, int second_bit);
 
-  void JumpIfBlack(Register object, Register scratch0, Register scratch1,
-                   Label* on_black);
-
-  // 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,
-                      Register scratch3, Label* object_is_white_and_not_data);
-
-  // Detects conservatively whether an object is data-only, i.e. it does need to
-  // be scanned by the garbage collector.
-  void JumpIfDataObject(Register value, Register scratch,
-                        Label* not_data_object);
+  // 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,
+                   Register scratch3, Label* value_is_white);
 
   // Notify the garbage collector that we wrote a pointer into an object.
   // |object| is the object being stored into, |value| is the object being