[PATCH] Don't copy objects with trivial, deleted copy ctors

[Reid Kleckner]

  - Fix zero ctor case

http://reviews.llvm.org/D3660

Files:
  lib/CodeGen/CGCXXABI.cpp
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/ItaniumCXXABI.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/uncopyable-args.cpp
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