RFR (T) 8221872: Remove ClassLoaderWeakHandle typedef

[coleen.phillimore at oracle.com]

Summary: Make consistent with StringTable and ResolvedMethodTable

We decided to not have this typedef because StringTable doesn't have it 
and the new concurrent hashtable for ResolvedMethodTable won't either.  
This will make it consistent.

Tested with hs tier1 on Oracle platforms.

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8221872.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8221872

Thanks,
Coleen