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

src/interface.cc

Index: src/interface.cc
diff --git a/src/interface.cc b/src/interface.cc
index 336be82c60f28089ac26d364c6d79771f7a279d1..1634a37113fca9c3266d9ca248354250725b1fb0 100644
--- a/src/interface.cc
+++ b/src/interface.cc
@@ -170,6 +170,8 @@ void Interface::DoUnify(Interface* that, bool* ok, Zone* zone) {
   ASSERT(that->forward_ == NULL);
   ASSERT(!this->IsValue());
   ASSERT(!that->IsValue());
+  ASSERT(this->index_ == -1);
+  ASSERT(that->index_ == -1);
   ASSERT(*ok);
 
 #ifdef DEBUG
@@ -194,15 +196,6 @@ void Interface::DoUnify(Interface* that, bool* ok, Zone* zone) {
     return;
   }
 
-  // Merge instance.
-  if (!that->instance_.is_null()) {
-    if (!this->instance_.is_null() && *this->instance_ != *that->instance_) {
-      *ok = false;
-      return;
-    }
-    this->instance_ = that->instance_;
-  }
-
   // Merge interfaces.
   this->flags_ |= that->flags_;
   that->forward_ = this;
@@ -227,7 +220,7 @@ void Interface::Print(int n) {
   } else if (IsValue()) {
     PrintF("value\n");
   } else if (IsModule()) {
-    PrintF("module %s{", IsFrozen() ? "" : "(unresolved) ");
+    PrintF("module %d %s{", Index(), IsFrozen() ? "" : "(unresolved) ");
     ZoneHashMap* map = Chase()->exports_;
     if (map == NULL || map->occupancy() == 0) {
       PrintF("}\n");