RFR 8213751: ClassLoaderDataGraph::cld_do() should sometimes require CLDG_lock

[coleen.phillimore at oracle.com]

ErikO and I had some offline conversation about the function naming, and 
decided on cld_do() to follow all CLDs and loaded_cld_do() to only 
follow the loaded CLDS, so I've reverted some of the GC cld_oops_do() 
changes.  Also always_strong_loaded_cld_do() doesn't make sense, so I 
removed that.

Incremental (somewhat of a revert) 
http://cr.openjdk.java.net/~coleenp/8213751.02.incr/webrev/index.html
Full: http://cr.openjdk.java.net/~coleenp/8213751.02/webrev/index.html

Reran serviceability tests and JFR tests.

Thanks,
Coleen

On 11/14/18 7:44 AM, coleen.phillimore at oracle.com wrote:
> Summary: Give GC own version of cld_oops_do and use cld_do for runtime 
> calls.
>
> This also adds a NoSafepointVerifier in the CLDG iterator.
>
> Tested with hs-tier1-3, vmTestbase/nsk, gc, runtime and JFR tests 
> locally.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/8213751.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8213751
>
> Thanks,
> Coleen