Bug 810526 - Add stack top to Thread{Info,Profile}. r=bgirard
Bug 810526 - Factor out native/pseudo stack merging. r=bgirard
Bug 810526 - Add multiple-include guard to android-signal-defs.h. r=bgirard
Bug 810526 - android-signal-defs.h must include signal.h for stack_t. r=bgirard
Bug 810526 - Add an implementation of ARM EHABI stack unwinding for the profiler. r=BenWa r=huseby