RFR (S) 8228630: Remove always true parameter to NoSafepointVerifier

[coleen.phillimore at oracle.com]

I fixed the comment in thread.hpp above the _allow_safepoint_count and 
renamed the field to _no_safepoint_count, which makes a lot more sense.  
Retesting.

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8228630.02/webrev

Thanks,
Coleen

On 7/30/19 4:45 PM, coleen.phillimore at oracle.com wrote:
> Summary: Also remove NoGCVerifier since NoSafepointVerifier covers GC 
> checking when not already at a safepoint and is a stronger check.
>
> See bug for more details also.  Tested with all jtreg 
> runtime,compiler,serviceability and gc tests.  Also hs-tier1-3 on 
> linux-x64-debug.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8228630.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8228630
>
> Thanks,
> Coleen