1 Select a strategy to mitigate speculative execution attacks (e.g., SPECTRE).
   2 The accepted values are:
   3                   None - No mitigations are used in JIT compiled code.
   4             AllTargets - All branches are protected against speculative attacks.
   5                          This has a significant performance impact.
   6           GuardTargets - Only branches that preserve Java memory safety are protected.
   7                          This has less performance impact than AllTargets.
   8   NonDeoptGuardTargets - GuardTargets except that branches which deoptimize are not
   9                          protected since they can not be executed repeatedly.