Bug 1016629 - a. Associate a native stack for each hang; r=vladan
Bug 1016629 - b. Use RAII class to assign mStackToFill; r=snorp
Bug 1016629 - c. Add define for ThreadStackHelper pseudostack support; r=snorp
Bug 1016629 - d. Add and implement GetNativeStack method in ThreadStackHelper; r=snorp r=jseward
Bug 1016629 - e. Implement platform-specific code for filling in context; r=snorp r=jseward
Bug 1016629 - f. Don't call dl_iterate_phdr if it's not available; r=BenWa
Bug 1016629 - g. Avoid ASan flag when copying stack; r=snorp
Bug 1034138 - a. Get native stack for permahangs in BHM; r=snorp
Bug 1034138 - b. Add thread hang native stack output to nsITelemetry; r=vladan
Bug 1034138 - c. Display thread hang native stack in about:telemetry if available; r=vladan
Bug 1034138 - d. Test BackgroundHangMonitor permahangs; r=vladan