RFR: 8154153: PS: Restore preserved marks in parallel

[Tony Printezis]

Follow-up change to do preserved mark restoration in parallel in PS:

http://cr.openjdk.java.net/~tonyp/8154153/webrev.0/

I also changed the “Promotion failed” log message from:
log_info(gc)("Promotion failed”);
to:
log_info(gc, promotion)("Promotion failed");
to be consistent with the other GCs.

Tony

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Tony Printezis | JVM/GC Engineer / VM Team | Twitter

@TonyPrintezis
tprintezis at twitter.com

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