Track how many pages trigger fallback strategies in GC

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index a44b094f4ee06accc4004634277df9622eda2e63..51bf38f20316e7ed5590d8c55155f6c166641780 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5063,7 +5063,7 @@ class V8_EXPORT Isolate {
   };
 
   /**
-   * Features reported via the SetUseCounterCallback callback. Do not chang
+   * Features reported via the SetUseCounterCallback callback. Do not change
    * assigned numbers of existing items; add new features to the end of this
    * list.
    */
@@ -5071,6 +5071,9 @@ class V8_EXPORT Isolate {
     kUseAsm = 0,
     kBreakIterator = 1,
     kLegacyConst = 2,
+    kMarkDequeOverflow = 3,
+    kStoreBufferOverflow = 4,
+    kSlotsBufferOverflow = 5,
     kUseCounterFeatureCount  // This enum value must be last.
   };