Merge the Merlin heap tracing to top-of-trunk.

runtime/vm/assembler_ia32.h

Index: runtime/vm/assembler_ia32.h
diff --git a/runtime/vm/assembler_ia32.h b/runtime/vm/assembler_ia32.h
index a738df396b888195f45c7ae30cb2565d53e6a931..46a439bd323477aeb230ec3718361309c79e0b66 100644
--- a/runtime/vm/assembler_ia32.h
+++ b/runtime/vm/assembler_ia32.h
@@ -554,6 +554,13 @@ class Assembler : public ValueObject {
                                 const FieldAddress& dest,
                                 const Object& value);
 
+  void TraceStoreIntoObject(Register object,
+                            const FieldAddress& dest,
+                            Register value);
+  void TraceStoreIntoObject(Register object,
+                            const FieldAddress& dest,
+                            const Object& value);
+
   void DoubleNegate(XmmRegister d);
   void FloatNegate(XmmRegister f);