Bug 919635 - Add manifests for Steeplechase tests to moz.build. r=gps

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extra : rebase_source : 9e0ac924da517d78d0d21e01730a1593ee917b31
bug 919635 - package Steeplechase tests and extra bits in test package. r=gps

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extra : rebase_source : b0030545c25da1f27c601363c84362470a32aee6
Bug 917841 - Use overflow-resistant arithmetic in binary searches. r=luke
Bug 867757, Part 2: Gives SPS the ability to immediately sample the current thread's stack and annotate it. r=BenWa