Reapply r9673 "Scope tree serialization and ScopeIterator cleanup."

src/ast-inl.h

Index: src/ast-inl.h
diff --git a/src/ast-inl.h b/src/ast-inl.h
index 731ad2ff3f2a8468ade4204ca5a78243ce1fa56c..a3af2596a869393204f93ff155ba75a0b070b3ca 100644
--- a/src/ast-inl.h
+++ b/src/ast-inl.h
@@ -111,6 +111,16 @@ ForInStatement::ForInStatement(Isolate* isolate, ZoneStringList* labels)
 }
 
 
+int FunctionLiteral::start_position() const {
+  return scope()->start_position();
+}
+
+
+int FunctionLiteral::end_position() const {
+  return scope()->end_position();
+}
+
+
 bool FunctionLiteral::strict_mode() const {
   return scope()->is_strict_mode();
 }