FunctionEntryHook: require no-snapshot build

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index ead6efa42c8dd2cce53616df84e86a02136280e0..ce2f459345f1374e361b126aba89a0fd4b9e3cc3 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -6357,8 +6357,9 @@ class V8_EXPORT Isolate {
      * The optional entry_hook allows the host application to provide the
      * address of a function that's invoked on entry to every V8-generated
      * function.  Note that entry_hook is invoked at the very start of each
-     * generated function. Furthermore, if an entry_hook is given, V8 will
-     * not use a snapshot, including custom snapshots.
+     * generated function.
+     * An entry_hook can only be provided in no-snapshot builds; in snapshot
+     * builds it must be nullptr.
      */
     FunctionEntryHook entry_hook;