[PATCH] [Tooling] Restore current directory after processing each file.

[Alexander Kornienko]

Hi klimek,

If we actually change directory before processing a file, we need to
restore it afterwards. This was broken in r216620.

Added a comment for the changes in r216620.

http://reviews.llvm.org/D6162

Files:
  lib/Tooling/Tooling.cpp
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