git: openjdk/loom: fibers: Stress tests take too long with fastdebug builds

[duke]

Changeset: d6e485dd
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2020-07-02 11:35:20 +0000
URL:       https://git.openjdk.java.net/loom/commit/d6e485dd

Stress tests take too long with fastdebug builds

- test/jdk/java/lang/Thread/virtual/PinALot.java
- test/jdk/java/lang/Thread/virtual/SleepALot.java
- test/jdk/java/lang/Thread/virtual/YieldALot.java
+ test/jdk/java/lang/Thread/virtual/stress/PinALot.java
+ test/jdk/java/lang/Thread/virtual/stress/SleepALot.java
+ test/jdk/java/lang/Thread/virtual/stress/YieldALot.java