[PATCH] ASTMatchers: Implement hasNextSibling()

[David Kilzer]

Hi klimek, krememek, jordan_rose,

In order to implement the static analyzer check in D5042 using ASTMatchers, I need the concept of a hasNextSibling() constraint.

The attached patch does not compile, but I'm wondering if I'm in the ballpark as far as implementation goes, or whether there is a better way to do this.  (See the FIXME comments in the patch for what's not implemented.)

http://reviews.llvm.org/D5105

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
  lib/ASTMatchers/ASTMatchFinder.cpp
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