Adding a type vector to replace type cells.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 3bf4db5780a31d041782b3f0aaf30d046ee5151b..2949c8445cb55372da9440157934f35f5fb8699d 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -103,6 +103,16 @@ class CompilationInfo {
     parameter_count_ = parameter_count;
   }
 
+  void set_feedback_slots(int feedback_slots) {
+    ASSERT(!IsStub());
+    ASSERT(feedback_slots_ == -1);  // Slots shouldn't yet be initialized.
+    feedback_slots_ = feedback_slots;
+  }
+  int feedback_slots() const {
+    ASSERT(feedback_slots_ >= 0);
+    return feedback_slots_;
+  }
+
   void set_this_has_uses(bool has_no_uses) {
     this_has_uses_ = has_no_uses;
   }
@@ -448,6 +458,9 @@ class CompilationInfo {
   // Number of parameters used for compilation of stubs that require arguments.
   int parameter_count_;
 
+  // Number of feedback slots to allocate for a normal function.
+  int feedback_slots_;
+
   bool this_has_uses_;
 
   Handle<Foreign> object_wrapper_;