[PATCH] add ConstEvaluatedExprVisitor

[scott douglass]

Adds a version of EvaluatedExprVisitor for visiting const Stmt*s and uses it in a few places thereby removing some casting away of const.  Changes EvaluatedExprVisitor to hold it's ASTContext& as const and adds a few 'const's that this allows.  Removes an spurious #include.

Overall, no functional change.  I'm also going to use ConstEvaluatedExprVisitor in a subsequent patch about side-effect of StmtExprs.

http://reviews.llvm.org/D10210

Files:
  llvm/tools/clang/include/clang/AST/EvaluatedExprVisitor.h
  llvm/tools/clang/include/clang/AST/Expr.h
  llvm/tools/clang/lib/AST/Expr.cpp
  llvm/tools/clang/lib/CodeGen/CGClass.cpp
  llvm/tools/clang/lib/Sema/AnalysisBasedWarnings.cpp
  llvm/tools/clang/lib/Sema/SemaExprCXX.cpp

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