* better seed selection

* slightly different weighting calculation

* remove unnecessary memset

The hangs could show long or infinite loops. This is important.

Co-authored-by: van Hauser <[email protected]>

A forkserver is started by afl_fsrv_get_mapsize() when dynamically
finding the map size.  When an input directory option is specified a
second fork server was also started.  This commit re-arranges the inits
for several forkserver struct members so that we can re-use the server
started by the get_mapsize() call when not in coresight/qemu/unicorn
modes and just start the server otherwise.

* Additional source code reformatting in afl-compiler-rt

* Add source code coverage support to afl-compiler-rt (for use with Nyx)

afl-fuzz.c: Document `-i -` in `--help`, to write that `-i` can be passed '-' to resume the prior fuzzing job. Also reference AFL_AUTORESUME so users know they can set that parameter to sidestep the issue entirely.

Update LLVM instructions, because versions higher than 14 are supported and to be explicit that LLD is also required