[CFL] Temporary work around MSAN issue.

MSAN recently broke on github actions. Add a command that works
around the issue to temporarily unbreak MSAN.
Remove this commit when the issue is fixed later this week.

Fixes: #11703

Author: jonathanmetzman

infra/cifuzz/run_fuzzers.py

@@ -15,6 +15,7 @@
 import enum
 import logging
 import os
+import subprocess
 import sys
 import time
 
@@ -307,6 +308,7 @@ def run_fuzzers(config):  # pylint: disable=too-many-locals
   Returns:
     A RunFuzzersResult enum value indicating what happened during fuzzing.
   """
+  subprocess.run(['sysctl', '-w', 'vm.mmap_rnd_bits=28'], check=False)
   fuzz_target_runner = get_fuzz_target_runner(config)
   if not fuzz_target_runner.initialize():
     # We didn't fuzz at all because of internal (CIFuzz) errors. And we didn't