* introduce reserve threads to minimize latency and maximize throughput when awaiting a future
* introduce a ceilDiv proc
* threadpool: implement parallel-for loops
* 10x perf improvement by not waking reserveBackoff on syncAll
* bench overhead: new reserve system might introduce too much wakeup latency, 2x slower, for fine-grained parallelism
* add parallelForStrided
* Threadpool: Implement parallel reductions
* refactor parallel loop codegen: introduce descriptor, parsing and codegen stages
* parallel strided, test transpose bench
* tight loop is faster when backoff is not inline
* no POSIX stuff on windows, larger types for histogram bench
* fix tests
* max RSS overflow?
* missed an undefined var
* exit histogram on 32-bit
* forgot to return early dor 32-bit
Mamy Ratsimbazafy