RFR (T) 8228673: Remove develop flag StrictSafepointChecks

[Aleksey Shipilev]

On 7/30/19 10:43 PM, coleen.phillimore at oracle.com wrote:
> Remove option to turn off checking.  See bug for more details.
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8228673.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8228673

Makes sense. Looks good.

It is curious that there is #ifdef ASSERT block in Thread::check_for_valid_safepoint_state body,
which is probably redundant too, if we discount the idiosyncrasy between (not_)debug and (not_)product.

-- 
Thanks,
-Aleksey