message: NFC: Use this-> to appease GCC bug related to template lambda.
  GCC is unable to properly implicitly capture 'this' in generic lambdas. This bug is not fixed until 7.1.0:
diff: @@ -1661,7 +1661,8 @@ LogicalResult Serializer::processOperation(Operation *opInst) {
  // Then handle all the ops that directly mirror SPIR-V instructions with
  // auto-generated methods.
  - .Default([&](auto *op) { return dispatchToAutogenSerialization(op); });
  + .Default(
  + [&](Operation *op) { return dispatchToAutogenSerialization(op); });
  }
  namespace {
  