[PATCH] Add 'return_typestate' function attribute

[Christian Wailes]

  Used a local variable instead of making a call.

Hi delesley, dblaikie, aaron.ballman,

http://llvm-reviews.chandlerc.com/D1567

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1567?vs=3976&id=3988#toc

Files:
  include/clang/Analysis/Analyses/Consumed.h
  include/clang/Basic/Attr.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Analysis/Consumed.cpp
  lib/Sema/AnalysisBasedWarnings.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/SemaCXX/warn-consumed-analysis-strict.cpp
  test/SemaCXX/warn-consumed-analysis.cpp
  test/SemaCXX/warn-consumed-parsing.cpp
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