[heap] Add API function for checking if the heap limit was increased

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index f7e2b376a33cacd7da75b40f40b1d19ae76bc396..75e439a56ec9abc098aa40738aa1d30be199f4d2 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -7075,6 +7075,12 @@ class V8_EXPORT Isolate {
   void RestoreOriginalHeapLimit();
 
   /**
+   * Returns true if the heap limit was increased for debugging and the
+   * original heap limit was not restored yet.
+   */
+  bool IsHeapLimitIncreasedForDebugging();
+
+  /**
    * Allows the host application to provide the address of a function that is
    * notified each time code is added, moved or removed.
    *