FunctionEntryHook: require no-snapshot build

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index aeb14e467711d6cea31513a86764146ba2c425a9..3081b6d6ab6e334afe19104d536403faafdc1525 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -239,6 +239,9 @@ config("features") {
   if (v8_enable_handle_zapping) {
     defines += [ "ENABLE_HANDLE_ZAPPING" ]
   }
+  if (v8_use_snapshot) {
+    defines += [ "V8_USE_SNAPSHOT" ]
+  }
   if (v8_use_external_startup_data) {
     defines += [ "V8_USE_EXTERNAL_STARTUP_DATA" ]
   }