Track representations of fields

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 345e945f98dc7dc2f802d2d5b66ecbd127ab373f..8f0d26cd609c42fe216fe3eee9489c7e007e94dc 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -59,6 +59,7 @@ class LCodeGen BASE_EMBEDDED {
         jump_table_(4, info->zone()),
         deoptimization_literals_(8, info->zone()),
         prototype_maps_(0, info->zone()),
+        transition_maps_(0, info->zone()),
         inlined_function_count_(0),
         scope_(info->scope()),
         status_(UNUSED),
@@ -414,6 +415,7 @@ class LCodeGen BASE_EMBEDDED {
   ZoneList<JumpTableEntry> jump_table_;
   ZoneList<Handle<Object> > deoptimization_literals_;
   ZoneList<Handle<Map> > prototype_maps_;
+  ZoneList<Handle<Map> > transition_maps_;
   int inlined_function_count_;
   Scope* const scope_;
   Status status_;