8357380: java/lang/StringBuilder/RacingSBThreads.java times out with C1

Reviewed-by: jpai

Author: Roger Riggs

test/jdk/java/lang/StringBuilder/RacingSBThreads.java

@@ -46,7 +46,7 @@
 public class RacingSBThreads {
 
     private static final int TIMEOUT_SEC = 1;   // Duration to run each test case
-    private static final int N = 10_000_000;    // static number of iterations for writes and modifies
+    private static final int N = 1_000_000;     // static number of iterations for writes and modifies
     private static final int LEN = 100_000;     // Length of initial SB
 
     // Strings available to be used as the initial contents of a StringBuilder