[PATCH] Improve attributes printing.

[Michael Han]

  Ping. Patch is updated to TOT.

Hi rsmith,

http://llvm-reviews.chandlerc.com/D395

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D395?vs=948&id=1120#toc

Files:
  lib/AST/DeclPrinter.cpp
  test/SemaCXX/attr-print.cpp
  test/SemaCXX/cxx11-attr-print.cpp
  test/Sema/attr-print.c
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