RFR (XS): 8151560:

[Rachel Protacio]

Hi,

Please review this fix for safepoint logging. The original conversion 
accidentally put a "debug" stream where a "trace" stream should have been.

Bug: https://bugs.openjdk.java.net/browse/JDK-8151560
Open webrev: http://cr.openjdk.java.net/~rprotacio/8151560/

Passes JPRT.

Thanks,
Rachel