fuzzing: Add a --release flag to the predicate script.

When you're not testing for debug assertions this is much faster.

Author: emilio

Cargo.lock

@@ -65,6 +65,10 @@
 
 reducing = parser.add_argument_group("reducing arguments", REDUCING_DESC.strip())
 
+reducing.add_argument(
+    "--release",
+    action="store_true",
+    help="Use a release instead of a debug build.")
 reducing.add_argument(
     "--expect-bindgen-fail",
     action="store_true",
@@ -194,13 +198,13 @@ def run_bindgen(args, bindings):
     manifest_path = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]),
                                                  "..",
                                                  "Cargo.toml"))
-    child = run(
-        ["cargo", "run",
-         "--manifest-path", manifest_path,
-         "--",
-         args.input, "-o", bindings] + shlex.split(args.bindgen_args),
-        stderr=subprocess.PIPE,
-        stdout=subprocess.PIPE)
+    command = ["cargo", "run", "--manifest-path", manifest_path]
+    if args.release:
+        command += ["--release"]
+    command += ["--", args.input, "-o", bindings]
+    command += shlex.split(args.bindgen_args)
+
+    child = run(command, stderr=subprocess.PIPE, stdout=subprocess.PIPE)
 
     if args.bindgen_grep:
         pattern = regexp(args.bindgen_grep)