[PATCH] Add a Fuzzer library

[Kostya Serebryany]

================
Comment at: lib/Fuzzer/FuzzerIO.cpp:18
@@ +17,3 @@
+  std::vector<std::string> V;
+  DIR *D = opendir(Dir.c_str());
+  if (!D) return V;
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majnemer wrote:
> Could you instead use `fs::directory_iterator` so that this works on Windows too?
No. This lib has to be independent from the rest of LLVM. 
Same below

http://reviews.llvm.org/D7184

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