Move EmbedderHeapTracer::TracePrologue call to the beginning of full gc

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 07513aa820117b8442135e3b986c55d88192f3b3..593b1694cc7a4be1fd4c755e491cf752090da38e 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5479,6 +5479,11 @@ class V8_EXPORT EmbedderHeapTracer {
    */
   virtual void TraceEpilogue() = 0;
 
+  /**
+   * Throw away all intermediate data and reset to the initial state.
+   */
+  virtual void AbortTracing() {}
+
  protected:
   virtual ~EmbedderHeapTracer() = default;
 };