RFR: 8154153: PS: Restore preserved marks in parallel

[Thomas Schatzl]

Hi Tony,

On Wed, 2016-04-13 at 09:24 -0400, Tony Printezis wrote:
> 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.
> 

- renaming of ParRestoreTask to ParRestoreGangTask: no other
AbstractGangTask child class has "Gang" in its name.

I can kind of see the name clashes with "ParRestoreGCTask", but I do
not think it really helps.

Feel free to ignore this, but maybe thinking about this again yields
some better names.

- preservedMarks.cpp needs a memory/resourceArea.hpp include due to the
use of ResourceMark.

- preservedMarks.cpp: line 118, maybe an extra CR makes the code look
less cramped.

- preservedMarks.cpp: line 128: style: if argument list needs to be
split across multiple lines, we (in the gc team) favor one argument per
line.

- some copyrights need updates

I will run it through jprt/some tests.

Thanks,
  Thomas