[PATCH] Use const visitors in ASTDumper

[Philip Craig]

  - Moved DeclVisitorBase into the namespace.
  - Formatting style fixes. I also changed some other for loops to match this style.

http://llvm-reviews.chandlerc.com/D355

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D355?vs=838&id=852#toc

Files:
  include/clang/AST/DeclVisitor.h
  include/clang/AST/Expr.h
  lib/AST/ASTDumper.cpp
  lib/AST/Expr.cpp
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