[PATCH] Improve attributes printing.

[Michael Han]

  Update patch to teach printPretty making the decision of print an attribute or not based on an enum value that identifies where the attribute appears around declaration and statement. For C++11 attributes, we always print them at the start of declarations or immediately after declarator-id to make sure they appertain to declarator rather than a type (since we don't support any such attribute yet.).

Hi rsmith,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D395?vs=1159&id=1315#toc

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