Tag smi-constants as smi. This also fixes code that copies holes into arrays.

src/property-details.h

Index: src/property-details.h
diff --git a/src/property-details.h b/src/property-details.h
index ac7ade465f6ad3abf63d9e31b6c804125288aa2d..3bb1f3368e9efdda6cdef3a6b95e9b003a5e4254 100644
--- a/src/property-details.h
+++ b/src/property-details.h
@@ -133,6 +133,7 @@ class Representation {
   bool IsSmi() const { return kind_ == kSmi; }
   bool IsSmiOrTagged() const { return IsSmi() || IsTagged(); }
   bool IsInteger32() const { return kind_ == kInteger32; }
+  bool IsSmiOrInteger32() const { return IsSmi() || IsInteger32(); }
   bool IsDouble() const { return kind_ == kDouble; }
   bool IsHeapObject() const { return kind_ == kHeapObject; }
   bool IsExternal() const { return kind_ == kExternal; }