llvm_mode error with llvm 13: "Oops, the instrumentation does not seem to be behaving correctly"

[hannob]

With latest llvm/clang (13.0.0) I can't compile the llvm_mode any more:

[*] Testing the CC wrapper and instrumentation output...
unset AFL_USE_ASAN AFL_USE_MSAN AFL_INST_RATIO; AFL_QUIET=1 AFL_PATH=. AFL_CC=clang ../afl-clang-fast -O3 -funroll-loops -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign -DAFL_PATH=\"/usr/local/lib/afl\" -DBIN_PATH=\"/usr/local/bin\" -DVERSION=\"2.57b\"  ../test-instr.c -o test-instr 
../afl-showmap -m none -q -o .test-instr0 ./test-instr < /dev/null
echo 1 | ../afl-showmap -m none -q -o .test-instr1 ./test-instr

Oops, the instrumentation does not seem to be behaving correctly!

[vanhauser-thc]

If this is fixed then it will break again with llvm 14 ... switch to afl++ instead