Copy propagated type info when inserting conversion.

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 18669)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -224,13 +224,13 @@
     Value* next_;
   };
 
-  explicit Value(Definition* definition)
+  explicit Value(Definition* definition, CompileType* type = NULL)
       : definition_(definition),
         previous_use_(NULL),
         next_use_(NULL),
         instruction_(NULL),
         use_index_(-1),
-        reaching_type_(NULL) { }
+        reaching_type_(type) { }
 
   Definition* definition() const { return definition_; }
   void set_definition(Definition* definition) { definition_ = definition; }
@@ -250,8 +250,10 @@
   static void AddToList(Value* value, Value** list);
   void RemoveFromUseList();
 
-  Value* Copy() { return new Value(definition_); }
+  Value* Copy() {return new Value(definition_); }
 
+  Value* CopyWithType() {return new Value(definition_, reaching_type_); }

[Vyacheslav Egorov (Google), 2013/02/19 14:45:49]

Please add a comment here that CopyWithType should only be used when one can
guarantee that it'll not be hoisted beyound the guard that guaranteed reaching
type.

[Florian Schneider, 2013/02/19 15:02:06]

Done.

+
   CompileType* Type();
 
   void SetReachingType(CompileType* type) {