Reland "Track field types.".

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 336c9f7cecc5e3b36590e867586fc62b6fc16c0a..a9bfd479308e62e4334ac8b7667b762600b7579a 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3382,6 +3382,10 @@ void HLoadNamedField::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
   access_.PrintTo(stream);
 
+  if (!map().IsNull()) {
+    stream->Add(" (%p)", *map().handle());
+  }
+
   if (HasDependency()) {
     stream->Add(" ");
     dependency()->PrintNameTo(stream);