[PATCH] D26596: [RFC] Add _LIBCPP_NO_DISCARD and apply it to `Container::empty()`, `unique_ptr<T>::release()`, and `Lockable::try_lock()`

[Eric Fiselier via cfe-commits]

EricWF updated this revision to Diff 77764.
EricWF added a comment.

- Fix tests containing discarded values.
- Fix two more instances of discarded `unique_ptr<T>::release()` in the headers.


https://reviews.llvm.org/D26596

Files:
  docs/UsingLibcxx.rst
  include/__config
  include/__hash_table
  include/__mutex_base
  include/algorithm
  include/deque
  include/ext/hash_map
  include/forward_list
  include/list
  include/locale
  include/map
  include/memory
  include/mutex
  include/regex
  include/set
  include/shared_mutex
  include/string
  include/string_view
  include/thread
  include/unordered_map
  include/unordered_set
  include/vector
  test/libcxx/containers/no-discard-disable.fail.cpp
  test/libcxx/containers/no-discard.fail.cpp
  test/libcxx/test/config.py
  test/libcxx/thread/thread.mutex/try_lock_no_discard.fail.cpp
  test/libcxx/thread/thread.mutex/try_lock_no_discard_disabled.fail.cpp
  test/libcxx/utilities/memory/unique.ptr/unique.ptr.runtime/unique.ptr.runtime.modifiers/release.fail.cpp
  test/libcxx/utilities/memory/unique.ptr/unique.ptr.single/unique.ptr.single.modifiers/release.fail.cpp
  test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock.pass.cpp
  test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_for.pass.cpp
  test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/try_lock_until.pass.cpp
  test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock.pass.cpp
  test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_for.pass.cpp
  test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/try_lock_until.pass.cpp

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