message: Moving from generally discouraged exit() to _Exit().
diff: #ifndef TINK_UTIL_STATUSOR_H_
  #define TINK_UTIL_STATUSOR_H_
  +#include <cstdlib>
  #include <iostream>
  #include <utility>
  @@ -77,7 +78,7 @@ class StatusOr {
  if (!ok()) {
  std::cerr << "Attempting to fetch value of non-OK StatusOr\n";
  std::cerr << status() << std::endl;
  - exit(1);
  + std::_Exit(1);
  }
  return value_;
  }
  @@ -85,7 +86,7 @@ class StatusOr {
  if (!ok()) {
  std::cerr << "Attempting to fetch value of non-OK StatusOr\n";
  std::cerr << status() << std::endl;
  - exit(1);
  + std::_Exit(1);
  }
  return value_;
  }
  @@ -93,7 +94,7 @@ class StatusOr {
  if (!ok()) {
  std::cerr << "Attempting to fetch value of non-OK StatusOr\n";
  std::cerr << status() << std::endl;
  - exit(1);
  + std::_Exit(1);
  }
  return std::move(value_);
  }
  @@ -101,7 +102,7 @@ class StatusOr {
  if (!ok()) {
  std::cerr << "Attempting to fetch value of non-OK StatusOr\n";
  std::cerr << status() << std::endl;
  - exit(1);
  + std::_Exit(1);
  }
  return std::move(value_);
  }
  @@ -127,7 +128,7 @@ inline StatusOr<T>::StatusOr(
  if (status.ok()) {
  std::cerr << "::crypto::tink::util::OkStatus() "
  << "is not a valid argument to StatusOr\n";
  - exit(1);
  + std::_Exit(1);
  }
  }
  