rts: Mark nonmoving GC paths in moving collector as unlikely
rts: Mark nonmoving GC paths in moving collector as unlikely

The expectation here is that the nonmoving GC is latency-centric,
whereas the moving GC emphasizes throughput. Therefore we give the
latter the benefit of better static branch prediction.

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc