[PATCH] Add a Fuzzer library

[Yury Gribov]

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Comment at: lib/Fuzzer/FuzzerMutate.cpp:36
@@ +35,3 @@
+  assert(MaxLen > 0);
+  assert(U->size() <= MaxLen);
+  switch (rand() % 3) {
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These asserts are not very user-friendly, perhaps check for them in main() instead? Actually I wonder if MaxLen should be MaxSizeIncreasePercentage...

http://reviews.llvm.org/D7184

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