[PATCH] Make DiagnosticsEngine::takeClient return std::unique_ptr<>

[Alexander Kornienko]

Hi dblaikie,

Make DiagnosticsEngine::takeClient return std::unique_ptr<>. Updated
callers to store conditional ownership using a pair of pointer and unique_ptr
instead of a pointer + bool. Updated code that temporarily registers clients to
use the non-owning registration (+ removed extra calls to takeClient).

http://reviews.llvm.org/D6294

Files:
  include/clang/Basic/Diagnostic.h
  include/clang/Frontend/VerifyDiagnosticConsumer.h
  include/clang/Rewrite/Frontend/FixItRewriter.h
  lib/Basic/Diagnostic.cpp
  lib/Frontend/ASTUnit.cpp
  lib/Frontend/CompilerInstance.cpp
  lib/Frontend/Rewrite/FixItRewriter.cpp
  lib/Frontend/VerifyDiagnosticConsumer.cpp
  tools/driver/driver.cpp
  unittests/Sema/ExternalSemaSourceTest.cpp
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