Subzero: Change llvm::OwningPtr to C++11's std::unique_ptr.

Subzero: Change llvm::OwningPtr to C++11's std::unique_ptr.

While I'm at it, normalize the #include order:

1. C++ library headers
2. LLVM headers
3. Subzero headers

A blank line between each group.  Each group sorted alphabetically, case-insensitive.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3930
R=jfb@chromium.org, jvoung@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=a18cc9c60a032e4a02ea0aef08bc758e5acb4cd0

[Jim Stichnoth, 2014-10-01 00:31:05]

stichnot@chromium.org changed reviewers:
+ jfb@chromium.org, jvoung@chromium.org, kschimpf@google.com

[Jim Stichnoth, 2014-10-01 00:36:49]

https://codereview.chromium.org/622443002/diff/20001/src/PNaClTranslator.cpp
File src/PNaClTranslator.cpp (right):

https://codereview.chromium.org/622443002/diff/20001/src/PNaClTranslator.cpp#...
src/PNaClTranslator.cpp:2383: OwningPtr<MemoryBuffer> MemBuf;
The obvious OwningPtr-->std::unique_ptr doesn't work here.  JF had something in
https://codereview.chromium.org/512933006/ but it also doesn't work, probably
because it combines unique_ptr with some LLVM 3.5 changes.

[JF, 2014-10-01 01:18:35]

lgtm

https://codereview.chromium.org/622443002/diff/20001/src/PNaClTranslator.cpp
File src/PNaClTranslator.cpp (right):

https://codereview.chromium.org/622443002/diff/20001/src/PNaClTranslator.cpp#...
src/PNaClTranslator.cpp:2383: OwningPtr<MemoryBuffer> MemBuf;
On 2014/10/01 00:36:49, stichnot wrote:
> The obvious OwningPtr-->std::unique_ptr doesn't work here.  JF had something
in
> https://codereview.chromium.org/512933006/ but it also doesn't work, probably
> because it combines unique_ptr with some LLVM 3.5 changes.

Yes, that API changed in 3.5. Leaving as-is is the only thing you can do here I
think, but the rest reduces the patching I'll need to do so that's good :)

[jvoung (off chromium), 2014-10-01 01:49:36]

lgtm

[Jim Stichnoth, 2014-10-01 02:10:26]

Committed patchset #2 (id:20001) manually as
a18cc9c60a032e4a02ea0aef08bc758e5acb4cd0 (presubmit successful).