android: Properly handle the CMC GC strategy

- With Google Play System Updates the base version of libart may differ
  from the Android version. For example, an Android 12 system could be
  using libart equivalent to the system version on Android 14.
- The function we were hooking in the MarkCompact GC was not the right
  spot to update the class pointers, causing crashes after some time.

Fixes #323, for real this time.

lib/android.js

@@ -1808,6 +1808,9 @@ on_leave_gc_concurrent_copying_copying_phase (GumInvocationContext * ic)
       Gc: {
         copyingPhase: {
           onLeave: cm.on_leave_gc_concurrent_copying_copying_phase
+        },
+        runFlip: {
+          onEnter: cm.on_leave_gc_concurrent_copying_copying_phase
         }
       }
     }
@@ -1885,19 +1888,22 @@ function ensureArtKnowsHowToHandleReplacementMethods (vm) {
 
   const apiLevel = getAndroidApiLevel();
 
-  let exportName = null;
-  if (apiLevel > 28) {
-    exportName = '_ZN3art2gc9collector17ConcurrentCopying12CopyingPhaseEv';
-  } else if (apiLevel > 22) {
-    exportName = '_ZN3art2gc9collector17ConcurrentCopying12MarkingPhaseEv';
-  }
-
-  if (exportName !== null) {
-    Interceptor.attach(Module.getExportByName('libart.so', exportName), artController.hooks.Gc.copyingPhase);
+  const mayUseCollector = (apiLevel > 28)
+    ? new NativeFunction(Module.getExportByName('libart.so', '_ZNK3art2gc4Heap15MayUseCollectorENS0_13CollectorTypeE'), 'bool', ['pointer', 'int'])
+    : () => false;
+  const kCollectorTypeCMC = 3;
 
-    const collectorCMC = Module.findExportByName('libart.so', '_ZN3art2gc9collector11MarkCompact15CompactionPhaseEv');
-    if (collectorCMC !== null) {
-      Interceptor.attach(collectorCMC, artController.hooks.Gc.copyingPhase);
+  if (mayUseCollector(getApi().artHeap, kCollectorTypeCMC)) {
+    Interceptor.attach(Module.getExportByName('libart.so', '_ZN3art6Thread15RunFlipFunctionEPS0_b'), artController.hooks.Gc.runFlip);
+  } else {
+    let exportName = null;
+    if (apiLevel > 28) {
+      exportName = '_ZN3art2gc9collector17ConcurrentCopying12CopyingPhaseEv';
+    } else if (apiLevel > 22) {
+      exportName = '_ZN3art2gc9collector17ConcurrentCopying12MarkingPhaseEv';
+    }
+    if (exportName !== null) {
+      Interceptor.attach(Module.getExportByName('libart.so', exportName), artController.hooks.Gc.copyingPhase);
     }
   }
 }