8033443: Test8000311 fails after latest changes to parallelize string and symbol table unlink Summary: When string and symbol table unlink are not performed in parallel, the claim index we check is not updated, and so a guarantee fails. Take this into account when checking the guarantee. Reviewed-by: brutisso, jwilhelm

8033601: G1: Make array chunking use the same length field as the other young GCs Summary: Use the old copy length instead of the length of the forwarded object for chunked arrays. Reviewed-by: brutisso, tschatzl