institute sane limits for arbitrary-based fuzzers

Author: addisoncrump

fuzz/ast-fuzzers.options

@@ -0,0 +1,2 @@
+[libfuzzer]
+max_len = 65536

fuzz/oss-fuzz-build.sh

@@ -14,5 +14,8 @@ targets=(
   ast_fuzz_match_bytes
 )
 for target in "${targets[@]}"; do
-  cp fuzz/target/x86_64-unknown-linux-gnu/release/$target $OUT/
+  cp "fuzz/target/x86_64-unknown-linux-gnu/release/${target}" "${OUT}/"
+  if [[ "$target" == ast_* ]]; then
+    cp fuzz/ast-fuzzers.options "${OUT}/${target}.options"
+  fi
 done