RFR (S): 8181785: Remove the experimental ClearFPUAtPark JVM Flag

[Kim Barrett]

> On Jun 8, 2017, at 11:04 AM, Erik Österlund <erik.osterlund at oracle.com> wrote:
> 
> Hi,
> 
> There is an experimental JVM flag called ClearFPUAtPark that is used only by SPARC. It is turned off by default and is marked as Unsafe and Unstable.
> The idea is to tell the Solaris kernel not to save floating point registers when context switching.
> I propose to remove it as it is an unstable option. It relies on an implicit unstable OS contract with the kernel that may or may not be honored.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8181785
> 
> Webrev: http://cr.openjdk.java.net/~eosterlund/8181785/webrev.00/
> 
> Testing: JPRT
> 
> Will need a sponsor.
> 
> Thanks,
> /Erik

Looks good.  Remember to update copyrights.

I can sponsor.