[PATCH] Represent empty declaration using a new Decl node EmptyDecl and let attribute declarations appertain to EmptyDecl.

[Michael Han]

  Patch updated to address review comments. Thanks!

Hi rsmith,

http://llvm-reviews.chandlerc.com/D448

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D448?vs=1072&id=1073#toc

Files:
  tools/libclang/RecursiveASTVisitor.h
  lib/Sema/SemaDeclCXX.cpp
  lib/AST/DeclBase.cpp
  lib/AST/Decl.cpp
  lib/AST/DeclPrinter.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/CodeGen/CGDecl.cpp
  lib/Parse/Parser.cpp
  lib/Serialization/ASTCommon.cpp
  lib/Serialization/ASTReaderDecl.cpp
  lib/Serialization/ASTWriterDecl.cpp
  test/Parser/cxx0x-attributes.cpp
  include/clang/AST/Decl.h
  include/clang/AST/RecursiveASTVisitor.h
  include/clang/Serialization/ASTBitCodes.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/DeclNodes.td
  include/clang/Sema/Sema.h
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