Inline allocation of implicit closures.

runtime/vm/ast.h

Index: runtime/vm/ast.h
===================================================================
--- runtime/vm/ast.h	(revision 348)
+++ runtime/vm/ast.h	(working copy)
@@ -366,6 +366,8 @@
   ClosureNode(intptr_t token_index, const Function& function, LocalScope* scope)
       : AstNode(token_index), function_(function), scope_(scope) {
     ASSERT(function.IsZoneHandle());
+    ASSERT(function.IsClosureFunction());
+    ASSERT(!function.IsImplicitClosureFunction());
     ASSERT(scope_ != NULL);
   }
 
@@ -389,6 +391,8 @@
   StaticImplicitClosureNode(intptr_t token_index, const Function& function)
       : AstNode(token_index), function_(function) {
     ASSERT(function.IsZoneHandle());
+    ASSERT(function.IsImplicitClosureFunction());
+    ASSERT(function.is_static());
   }
 
   const Function& function() const { return function_; }
@@ -411,6 +415,8 @@
                       AstNode* receiver)
       : AstNode(token_index), function_(function), receiver_(receiver) {
     ASSERT(function.IsZoneHandle());
+    ASSERT(function.IsImplicitClosureFunction());
+    ASSERT(!function.is_static());
   }
 
   const Function& function() const { return function_; }