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

src/lithium.h

Index: src/lithium.h
diff --git a/src/lithium.h b/src/lithium.h
index 388f5658db67c45b2b87f7841c6d0d124c2252c6..85df95a138dd8072674c11334ea7b29f1d70a606 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -558,7 +558,7 @@ class LEnvironment: public ZoneObject {
                 Representation representation,
                 bool is_uint32) {
     values_.Add(operand, zone());
-    if (representation.IsTagged()) {
+    if (representation.IsSmiOrTagged()) {
       ASSERT(!is_uint32);
       is_tagged_.Add(values_.length() - 1);
     }