Factor out handling of mixed objects preprocessing after migration

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 026166fbf70ee7e8755215361914abddc698c038..3ac52bdf626024a33f52a428db0449b4a1a5e9af 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1549,6 +1549,22 @@ bool HeapObject::MayContainRawValues() {
 }
 
 
+bool HeapObject::MayContainMixedValues() {
+  InstanceType type = map()->instance_type();
+  switch (type) {
+    case CONSTANT_POOL_ARRAY_TYPE:
+    case JS_FUNCTION_TYPE:
+      return true;
+    default:
+      if (type >= FIRST_FIXED_TYPED_ARRAY_TYPE &&
+          type <= LAST_FIXED_TYPED_ARRAY_TYPE) {
+        return true;
+      }
+      return false;
+  }
+}
+
+
 void HeapObject::IteratePointers(ObjectVisitor* v, int start, int end) {
   v->VisitPointers(reinterpret_cast<Object**>(FIELD_ADDR(this, start)),
                    reinterpret_cast<Object**>(FIELD_ADDR(this, end)));