Use a CNodeRef rather than explicit reference  counting in PV (#2145)
Use a CNodeRef rather than explicit reference  counting in PV (#2145)

Pass a CNodeRef to HandleBlockMessageThread() and remove
the pnode->AddRef() before launching the thread
and also remove the  pnode->Release() after the thread exits. Using
the CNodeRef is safer and ensures that the ref counting is correctly
maintained as we move across thread boundaries.
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