Fix external callback logging in profiler.

src/vm-state.h

Index: src/vm-state.h
diff --git a/src/vm-state.h b/src/vm-state.h
index 81a90e3c080e312481924358386f4547e7ffddfe..7e723a5282b426c16360984900b8feecee7ddc51 100644
--- a/src/vm-state.h
+++ b/src/vm-state.h
@@ -33,7 +33,14 @@ class ExternalCallbackScope BASE_EMBEDDED {
   inline ExternalCallbackScope(Isolate* isolate, Address callback);
   inline ~ExternalCallbackScope();
   Address callback() { return callback_; }
-  Address* callback_address() { return &callback_; }
+  Address* callback_entrypoint_address() {
+    if (callback_ == nullptr) return nullptr;
+#if USES_FUNCTION_DESCRIPTORS
+    return FUNCTION_ENTRYPOINT_ADDRESS(callback_);
+#else
+    return &callback_;
+#endif
+  }
   ExternalCallbackScope* previous() { return previous_scope_; }
   inline Address scope_address();