[PATCH] unique_ptr with ability to get a raw pointer after release.

[Антон Ярцев]

Hi dblaikie,

The work is inspired by r215176 and comment to r217791.
unique_ptr_deferred_release is intended for use in cases when conditional releases are mixed with raw pointer access, e.g:

    unique_ptr_deferred_release<Type> P(new P);
    if (cond) {
      P.deferred_release();
    }
    assert(P.get()); // 'true' regardless of whether deferred_release() was called or not.
    NonOwningFunction(P.get());

Please review!

http://reviews.llvm.org/D5443

Files:
  include/llvm/ADT/STLExtras.h
  unittests/ADT/CMakeLists.txt
  unittests/ADT/UniquePtrDeferredRelease.cpp
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