process: use frozen array for process.allowedNodeEnvironmentFlags
Maintain no-op calls of Set
prototype methods to process.allowedNodeEnvironmentFlags
for backward compatibility.
Labeled as semver-major
as it makes following code throw:
Set.prototype.add.call(process.allowedNodeEnvironmentFlags, '--user-option`);
process.allowedNodeEnvironmentFlags.has('--user-option') === true;
Originally suggested by @trott in https://github.com/nodejs/node/pull/36660#pullrequestreview-579893872.