RFR: 8151556: Use the PreservedMarks* classes for the G1 preserved mark stacks

[Thomas Schatzl]

Hi Tony,

On Wed, 2016-04-20 at 09:45 -0400, Tony Printezis wrote:
> Thanks Thomas for looking at it.
> 
> I had completely missed the "To-space exhausted" message (was looking
> for promotion / evacuation failure):
> 
> [1.194s][info][gc           ] GC(3) To-space exhausted
> 
> I kinda prefer “To-space exhausted” I have to say (maybe, it’s not
> always promotion to old that fails). I’d vote to leave it as is. If
> we want consistency, maybe we change the “Promotion failed” messages
> to “To-space exhausted” (on a separate CR, though)?

  I am fine either way, as long as it is consistent. Makes life a lot
easier to only need to grep for a single string regardless of gc. :)

Doing that in another CR is fine too.

Thanks,
  Thomas