[PATCH] replaced callable_when_unconsumed annotation with generic callable_when annotation

[Christian Wailes]

Hi dblaikie, delesley, rsmith, aaron.ballman,

The callable_when annotation can take a list of states that a function can be called in.  This reduced the total number of annotations needed and makes writing more complicated behaviour less burdensome.

To allow the the callable_when attribute to hold a variable number of states a VariadicEnumArgument Tablegen attribute classes was added.  Future work should replace the various Variadic attribute classes with a single class that takes another attribute as a parameter.  A FIXME has been added to indicate this at the request of Richard Smith.

http://llvm-reviews.chandlerc.com/D1613

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
  utils/TableGen/ClangAttrEmitter.cpp
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