RFR(XS) 8031065: LowMemoryTest2.sh fails: OutOfMemoryError: Metaspace

[Mattias Tobiasson]

Hi,
Could you please review this test fix.

The test verifies that MemoryPoolMXBean sends a notification when used memory has reached the threshold.
The flag thresholdExceeded marks if we have reached the memory threshold. When the flag is set, the test slows down to give time for the notification to be received. 
The problem is that thresholdExceeded is overwritten every time in the loop. Instead it should be set if any pool has reached the threshold. This means that the test continues to allocate memory at full speed, and we may get an OutOfMemory before we get the notification.

bug:
https://bugs.openjdk.java.net/browse/JDK-8031065

webrev:
http://cr.openjdk.java.net/~ykantser/8031065/webrev.00/

Mattias