RFR: Add asserts all over synchronizer

[Aleksey Shipilev]

On 10/06/2016 07:06 PM, Roman Kennke wrote:
> Aleksey pointed out in private that we could just as well make
> synchronizer and biasedlocking use oopDesc::cas_set_mark() and then put
> the asserts there and in oopDesc::set_mark() and
> oopDesc::release_set_mark(). That should give us better coverage. So
> here it is:
> 
> http://cr.openjdk.java.net/~rkennke/assertsynchronizer/webrev.01/
> 
> Ok now?

Yes. Eager to see all those little places where it crashes with
Shenandoah. Maybe run TEST="hotspot_all" on Shenandoah/fastdebug before
pushing?

-Aleksey