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

src/ppc/code-stubs-ppc.cc

Index: src/ppc/code-stubs-ppc.cc
diff --git a/src/ppc/code-stubs-ppc.cc b/src/ppc/code-stubs-ppc.cc
index 78820fbcc5f5ac65c99a6ca2f9b17ac0a66f37c6..02332972961a0ee6ee1600e6b357c2839f83ae79 100644
--- a/src/ppc/code-stubs-ppc.cc
+++ b/src/ppc/code-stubs-ppc.cc
@@ -4232,11 +4232,11 @@ void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
   // We need extra registers for this, so we push the object and the address
   // register temporarily.
   __ Push(regs_.object(), regs_.address());
-  __ EnsureNotWhite(regs_.scratch0(),  // The value.
-                    regs_.scratch1(),  // Scratch.
-                    regs_.object(),    // Scratch.
-                    regs_.address(),   // Scratch.
-                    &need_incremental_pop_scratch);
+  __ JumpIfWhite(regs_.scratch0(),  // The value.
+                 regs_.scratch1(),  // Scratch.
+                 regs_.object(),    // Scratch.
+                 regs_.address(),   // Scratch.
+                 &need_incremental_pop_scratch);
   __ Pop(regs_.object(), regs_.address());
 
   regs_.Restore(masm);