RFR (S): 8199326: Remove G1 gc time stamp logic

[Stefan Johansson]

Hi Thomas,

On 2018-03-08 14:33, Thomas Schatzl wrote:
> Hi,
>
>    with the rebuild remsets concurrently changes the last user of the gc
> time stamps (create live data) has gone away.
>
> This change removes all of the corresponding code I could find.
>
> Could you review it?
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8199326
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8197932/webrev/
Looks like you pasted the wrong link, and I couldn't find the correct 
one either.

Stefan
> Testing:
> hs-tier1
>
> Thanks,
>    Thomas
>