Collect type information based on stack allocated values for OSR.

src/typing.h

Index: src/typing.h
diff --git a/src/typing.h b/src/typing.h
index a111ae5fd1594d14868ba2db80df27a34e2caf1e..8c2fc050c447f42d256e08b4e1952ddfd2108d62 100644
--- a/src/typing.h
+++ b/src/typing.h
@@ -58,6 +58,10 @@ class AstTyper: public AstVisitor {
  private:
   explicit AstTyper(CompilationInfo* info);
 
+  Handle<Type> ObserveType(Object* value);
+  void ObserveTypesOnStack();
+  Handle<Type> GetObservedType(Variable* var);
+
   static const int kNoVar = INT_MIN;
   typedef v8::internal::Effects<int, kNoVar> Effects;
   typedef v8::internal::NestedEffects<int, kNoVar> Store;
@@ -65,6 +69,8 @@ class AstTyper: public AstVisitor {
   CompilationInfo* info_;
   TypeFeedbackOracle oracle_;
   Store store_;
+  ZoneList<Handle<Type> >* parameter_types_;
+  ZoneList<Handle<Type> >* stack_local_types_;
 
   TypeFeedbackOracle* oracle() { return &oracle_; }
   Zone* zone() const { return info_->zone(); }