8368371: runtime/valhalla/inlinetypes/classloading/ConcurrentClassLoadingTest.java timeouts

Reviewed-by: dsimms

Author: Arraying

test/hotspot/jtreg/runtime/valhalla/inlinetypes/classloading/ConcurrentClassLoadingTest.java

@@ -42,7 +42,7 @@
 // This test makes use of BigClassTreeClassLoader. Please refer to its documentation.
 class ConcurrentClassLoadingTest {
     private static final boolean DEBUG = false;
-    private static final int N_ITER = 250;
+    private static final int N_ITER = 125;
     private static final int DEPTH = 100;
 
     @Test