[PATCH] Prevent LoopConvert from shadowing already defined variables with the same name as the loop variable.

[Edwin Vane]

  Now this feels nice and clean:) Maybe we should look into using ASTContext's parent map to replace ReverseAST in the future. LoopConvert predates the parent map so it could probably be improved.

http://llvm-reviews.chandlerc.com/D950