* forkserver: Add an API to setup the shared memory region for edge coverage
This is inspired from and meant to be similar to afl-cc's instrumentation.
Remove ! return type from __afl_start_forkserver as it returns in several cases.
* Add example fuzzer using LibAFL's forkserver
The fuzzer is instrumented with libafl_cc as well.
Co-authored-by: ergrelet <ergrelet@users.noreply.github.com>
