[PATCH] D32106: [libcxx][test] Expand LWG2857 coverage

[Casey Carter via Phabricator via cfe-commits]

CaseyCarter created this revision.

- Cover `optional`'s emplace-from-`initializer_list` overload
- Verify that `any::emplace` and `optional::emplace` return a reference to the correct type even for throwing cases


https://reviews.llvm.org/D32106

Files:
  test/std/utilities/any/any.class/any.modifiers/emplace.pass.cpp
  test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
  test/std/utilities/optional/optional.object/optional.object.assign/emplace_initializer_list.pass.cpp

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