Fix: insert additional jvm argument for iOS 26

Automatically add `-XX:+MirrorMappedCodeCache` for iOS 26.
This can also be used on lower iOS and useful for live debugging, but it doubles the virtual memory usage for code cache, hence it’s not a default.

Signed-off-by: Duy Tran <40482367+khanhduytran0@users.noreply.github.com>

Author: khanhduytran0

Natives/JavaLauncher.m

@@ -226,6 +226,11 @@ int launchJVM(NSString *username, id launchTarget, int width, int height, int mi
     margv[++margc] = "-XX:+UnlockExperimentalVMOptions";
     margv[++margc] = "-XX:+DisablePrimordialThreadGuardPages";
 
+    // On iOS 26, use mirror mapped JIT by default
+    if (@available(iOS 26.0, *)) {
+        margv[++margc] = "-XX:+MirrorMappedCodeCache";
+    }
+
     // Disable Forge 1.16.x early progress window
     margv[++margc] = "-Dfml.earlyprogresswindow=false";