Verifying that custom mutator is loaded successfully by libFuzzer
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Description
this was discussed in https://github.com/google/clusterfuzz/pull/1333
https://reviews.llvm.org/D73136 was landed a month ago as https://github.com/llvm/llvm-project/commit/15f1d5d14425528540e1cc4aa776b195a2e1e7e0
and we're using https://github.com/llvm/llvm-project/commit/c29003813ab9bd6ea7b6de40ea8f1fe21979f13f which is a newer revision
which means now we can check the presence of `INFO: found LLVMFuzzerCustomMutator` in the fuzzer log to verify that the custom mutator was indeed used
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