Get rid of static module allocation, do it in code.

src/interface.h

Index: src/interface.h
diff --git a/src/interface.h b/src/interface.h
index 94ef11ba5c29d40f40e3755cafd16f2837252cfc..f824a9a8749b91b59805034d924eff5fd70f7fab 100644
--- a/src/interface.h
+++ b/src/interface.h
@@ -108,18 +108,18 @@ class Interface : public ZoneObject {
     if (*ok) Chase()->flags_ |= MODULE;
   }
 
-  // Set associated instance object.
-  void MakeSingleton(Handle<JSModule> instance, bool* ok) {
-    *ok = IsModule() && Chase()->instance_.is_null();
-    if (*ok) Chase()->instance_ = instance;
-  }
-
   // Do not allow any further refinements, directly or through unification.
   void Freeze(bool* ok) {
     *ok = IsValue() || IsModule();
     if (*ok) Chase()->flags_ |= FROZEN;
   }
 
+  // Assign an index.
+  void Allocate(int index) {
+    ASSERT(IsModule() && IsFrozen() && Chase()->index_ == -1);
+    Chase()->index_ = index;
+  }
+
   // ---------------------------------------------------------------------------
   // Accessors.
 
@@ -138,7 +138,23 @@ class Interface : public ZoneObject {
   // Check whether this is closed (i.e. fully determined).
   bool IsFrozen() { return Chase()->flags_ & FROZEN; }
 
-  Handle<JSModule> Instance() { return Chase()->instance_; }
+  bool IsUnified(Interface* that) {
+    return Chase() == that->Chase()
+        || (this->IsValue() == that->IsValue() &&
+            this->IsConst() == that->IsConst());
+  }
+
+  int Length() {
+    ASSERT(IsModule() && IsFrozen());
+    ZoneHashMap* exports = Chase()->exports_;
+    return exports ? exports->occupancy() : 0;
+  }
+
+  // The context slot in the hosting global context pointing to this module.
+  int Index() {
+    ASSERT(IsModule() && IsFrozen());
+    return Chase()->index_;
+  }
 
   // Look up an exported name. Returns NULL if not (yet) defined.
   Interface* Lookup(Handle<String> name, Zone* zone);
@@ -194,12 +210,13 @@ class Interface : public ZoneObject {
   int flags_;
   Interface* forward_;     // Unification link
   ZoneHashMap* exports_;   // Module exports and their types (allocated lazily)
-  Handle<JSModule> instance_;
+  int index_;
 
   explicit Interface(int flags)
     : flags_(flags),
       forward_(NULL),
-      exports_(NULL) {
+      exports_(NULL),
+      index_(-1) {
 #ifdef DEBUG
     if (FLAG_print_interface_details)
       PrintF("# Creating %p\n", static_cast<void*>(this));