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

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 802ac65962501dfa47db0f43f4e4de95c984a145..c83c490b099f9c64642fcc08110ebff1bd6f12a8 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -75,6 +75,7 @@ namespace internal {
 
 #define STATEMENT_NODE_LIST(V)                  \
   V(Block)                                      \
+  V(ModuleStatement)                            \
   V(ExpressionStatement)                        \
   V(EmptyStatement)                             \
   V(IfStatement)                                \
@@ -522,7 +523,7 @@ class ModuleDeclaration: public Declaration {
   ModuleDeclaration(VariableProxy* proxy,
                     Module* module,
                     Scope* scope)
-      : Declaration(proxy, LET, scope),
+      : Declaration(proxy, MODULE, scope),
         module_(module) {
   }
 
@@ -645,6 +646,25 @@ class ModuleUrl: public Module {
 };
 
 
+class ModuleStatement: public Statement {
+ public:
+  DECLARE_NODE_TYPE(ModuleStatement)
+
+  VariableProxy* proxy() const { return proxy_; }
+  Block* body() const { return body_; }
+
+ protected:
+  ModuleStatement(VariableProxy* proxy, Block* body)
+      : proxy_(proxy),
+        body_(body) {
+  }
+
+ private:
+  VariableProxy* proxy_;
+  Block* body_;
+};
+
+
 class IterationStatement: public BreakableStatement {
  public:
   // Type testing & conversion.
@@ -1417,7 +1437,7 @@ class VariableProxy: public Expression {
   void MarkAsTrivial() { is_trivial_ = true; }
   void MarkAsLValue() { is_lvalue_ = true; }
 
-  // Bind this proxy to the variable var.
+  // Bind this proxy to the variable var. Interfaces must match.
   void BindTo(Variable* var);
 
  protected:
@@ -2647,6 +2667,11 @@ class AstNodeFactory BASE_EMBEDDED {
   STATEMENT_WITH_LABELS(SwitchStatement)
 #undef STATEMENT_WITH_LABELS
 
+  ModuleStatement* NewModuleStatement(VariableProxy* proxy, Block* body) {
+    ModuleStatement* stmt = new(zone_) ModuleStatement(proxy, body);
+    VISIT_AND_RETURN(ModuleStatement, stmt)
+  }
+
   ExpressionStatement* NewExpressionStatement(Expression* expression) {
     ExpressionStatement* stmt = new(zone_) ExpressionStatement(expression);
     VISIT_AND_RETURN(ExpressionStatement, stmt)