[PATCH] Add an emplace(...) method to llvm::Optional<T>.

[Jordan Rose]

Hi dblaikie,

This can be used for in-place initialization of non-moveable types. Only available on compilers that support variadic templates.

Inspired by std::experimental::optional from the "Library Fundamentals" C++ TS ([[ http://en.cppreference.com/w/cpp/experimental/optional | API ]], [[ http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4082.pdf | spec ]]).

http://reviews.llvm.org/D5508

Files:
  include/llvm/ADT/Optional.h
  unittests/ADT/OptionalTest.cpp
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