Implement HChange support for Smis and use it in Load/StoreNameField

src/property-details.h

Index: src/property-details.h
diff --git a/src/property-details.h b/src/property-details.h
index 674fc8869ad58b59e17e0a85df999a0c74563974..9107290aa03a1ac7af0b2de92e6ccbf37a614488 100644
--- a/src/property-details.h
+++ b/src/property-details.h
@@ -131,6 +131,7 @@ class Representation {
   bool IsNone() const { return kind_ == kNone; }
   bool IsTagged() const { return kind_ == kTagged; }
   bool IsSmi() const { return kind_ == kSmi; }
+  bool IsSmiOrTagged() const { return IsSmi() || IsTagged(); }
   bool IsInteger32() const { return kind_ == kInteger32; }
   bool IsDouble() const { return kind_ == kDouble; }
   bool IsHeapObject() const { return kind_ == kHeapObject; }