Reviewed-by: dholmes, bdelsart

Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank

Summary: Update the Major and Build numbers for HS21
Reviewed-by: jcoomes

Summary: A race between the concurrent cleanup thread and the VM thread while it is processing the "expanded sparse table list" causes both threads to try to free the same sparse table entry and either causes one of the threads to fail or leaves the entry in an inconsistent state. The solution is purge all entries on the expanded list that correspond go regions that are being cleaned up.
Reviewed-by: brutisso, johnc

Summary: Use lea to compute field address in AtomicLongCSImpl::attemptUpdate() intrinsic on x86.
Reviewed-by: never, kvn

Summary: Implement support for ParallelRefProcEnabled in the reference processing that takes place at the end of G1 concurrent marking.
Reviewed-by: tonyp, ysr

Summary: Restore use of stillborn flag
Reviewed-by: acorn, alanb

Reviewed-by: iveresov, twisti

Reviewed-by: iveresov, twisti

Summary: Two small fixes to deal with a guarantee failure (the marking thread should join the SuspendibleThreadSet before calling a method that does pause prediction work so that said method is never called during a pause) and an assert failure (an assert is too strong).
Reviewed-by: iveresov, johnc

Summary: Use long jumps to get from patching stubs to deopt blob
Reviewed-by: kvn, never