Tighten up blocks rewriter to handle casts and some other interesting cases.

This fixes <rdar://problem/6289007> clang block rewriter: ^ in cast is not rewritten.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57591 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed