docs: Add some information about Fuzzing LLVM itself

Description

docs: Add some information about Fuzzing LLVM itself

This splits some content out of the libFuzzer docs and adds a fair
amount of detail about the fuzzers in LLVM.

Details

Committed
bognerOct 11 2017, 6:44 PM
Parents
rL315543: Rename P -> Pieces.
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