[PATCH] D37024: [libcxx] [test] Cleanup nullopt_t tests

[Casey Carter via Phabricator via cfe-commits]

CaseyCarter created this revision.

- Update specification text from N4387

- Delete `not_brace_initializable.fail.cpp`: it's redundant with `nullopt_t.fail.cpp`

- `is_empty<T>` implies `is_class<T>`

- `is_literal` is deprecated; directly verify that we can create a `nullopt_t` in a `constexpr` context


https://reviews.llvm.org/D37024

Files:
  test/std/utilities/optional/optional.nullopt/not_brace_initializable.fail.cpp
  test/std/utilities/optional/optional.nullopt/nullopt_t.fail.cpp
  test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp

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