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* heuristic to go farther during stack traces. * significantly improved Linux thread handing. acid: * update to new libmach interface. prof: * use new libmach interface. * multiple thread support (derived from Rob's copy). * first steps toward pprof-like graphs: keep counters indexed by pc,callerpc pairs. R=r DELTA=909 (576 added, 123 deleted, 210 changed) OCL=24240 CL=24259