[PATCH] Use const visitors in ASTDumper

[Philip Craig]

This is a followup to an earlier review comment.

The new ConstDeclVisitor is modeled after ConstStmtVisitor. I had to put the DeclVisitor.h version of make_ptr/make_const_ptr in a namespace to avoid a conflict with StmtVisitor.h. Is there a common header that it would make sense to move these to?

There are still some const_cast for template specialization iterators. Removing those will take a bit more effort; let me know if you think it is worth doing.

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

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