b=932400 remove refcount manipulation of streams when reordering for processing r=roc

--HG--
extra : rebase_source : f99f4220b53a28a32e9a294b67f4db6218113d73
b=932400 change stream ordering to get feedback DelayNode output before supplying input r=roc

Previously downstream nodes from DelayNodes in cycles sometimes received stale
output from the previous MSG iteration.

Also, if two cycles share a common path, they will now *both* be treated as
cycles, either by muting or by enforcing minimum delay.  Previously, marking
one cycle first could prevent detection of other cycles in the same SCC.

--HG--
extra : rebase_source : 82892c538c5ce514165b5f975474df15b99e3d2b