SuspendibleThreadSet is used in G1 to allow GC threads to participate in safepointing. It seems very useful for other GCs too and should be made available in a shared source directory.
            
- relates to
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                    JDK-8152199 Restructure SuspendibleThreadSet::synchronize -           
- Open
 
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                    JDK-8163329 JEP 304: Garbage Collector Interface -           
- Closed
 
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