Thread status constants

[Kyle Van Berendonck]

Hi,

I found these:
https://github.com/ghc/ghc/blob/5f3c5384df59717ca8013c5df8d1f65692867825/includes/rts/Constants.h#L194

They go only 0-14, so there's some long chains of branches and stuff in hot
paths that could be cleaned up into single &-masked branches by changing
these into a set of flags.

And then I saw these:
https://github.com/ghc/ghc/blob/master/libraries/base/GHC/Conc/Sync.lhs#L483

Where does 16 and 17 come from -- I couldn't find them in the header files
anywhere?

Kyle
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