[PATCH] Add clang-fuzzer target

[Chandler Carruth]

================
Comment at: CMakeLists.txt:537
@@ +536,3 @@
+if( LLVM_USE_SANITIZE_COVERAGE )
+  add_subdirectory(fuzzer)
+endif()
----------------
This should be in tools/

http://reviews.llvm.org/D7289

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