Take ast node id counting away from Isolate.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index e8beca5a05a68f2230108bec4127c16f5ef189f1..6a875482a65f10a53c13612af340b2f8bc8b0bea 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -365,6 +365,8 @@ class CompilationInfo {
     ast_value_factory_owned_ = owned;
   }
 
+  int* ast_node_id_counter() { return &ast_node_id_counter_; }
+
  protected:
   CompilationInfo(Handle<Script> script,
                   Zone* zone);
@@ -511,6 +513,7 @@ class CompilationInfo {
 
   AstValueFactory* ast_value_factory_;
   bool ast_value_factory_owned_;
+  int ast_node_id_counter_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };