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The current algorithm requires threads to commit/cancel waiting in order they called Prewait. Spinning caused by that serialization can consume lots of CPU time on some workloads. Restructure the algorithm to not require that serialization and remove spin waits from Commit/CancelWait. Note: this reduces max number of threads from 2^16 to 2^14 to leave more space for ABA counter (which is now 22 bits). Implementation details are explained in comments.
bug #1684: add simplified regression test for respective clang's bug (this also reveal the same bug in Apples's clang)
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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