[PATCH] Improve attributes printing.

[Michael Han]

  Slightly change the logic of dealing with each type of attributes and add more test cases :)

  For C++11 attributes, they could be printed anywhere except at end of declaration; for GNU attributes, we enforce that these attributes only appear at end of declaration to prevent them printing out multiple times; for special declaration location like empty declaration, we don't check the print constraints so all types of attributes are printed.

  Richard, what's your thoughts on this approach? I think I understand the principals you mentioned in last review, but I don't know how to apply it to cases like these so both can be printed out correctly if we only allow C++11 attributes to print on a single location:
  [[...]] int x;
  struct [[...]] s;

  Thanks!

Hi rsmith,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D395?vs=1315&id=1362#toc

Files:
  test/SemaCXX/cxx11-attr-print.cpp
  include/clang/AST/Attr.h
  utils/TableGen/ClangAttrEmitter.cpp
  lib/AST/DeclPrinter.cpp
  lib/AST/StmtPrinter.cpp
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