Set interface_call to true be default (pytorch#86668)

Summary: ASR models need it

Test Plan: existing unit tests

Reviewed By: cccclai

Differential Revision: D40251788

Pull Request resolved: pytorch#86668
Approved by: https://github.com/cccclai

torch/csrc/jit/serialization/export_module.cpp

@@ -424,8 +424,11 @@ SourceRangeRecords getBackendSourceRanges(const Module& m) {
   return sr_records;
 }
 
+// TODO: remove mobileInterfaceCallExport as it is no longer needed.
+// This function was introduced to guard the usage of `InterfaceCall` and
+// now the support for `InterfaceCall` should be mature enough.
 auto& mobileInterfaceCallExport() {
-  static std::atomic<bool> flag{false};
+  static std::atomic<bool> flag{true};
   return flag;
 }