LLHUDObject has a lot of deriveds stored as LLPointer<LLHUDObject>, no-virtual destructor is unlikely to be cause of the crash, but might be related

following promotion of DRTVWR-482

LLVOAvatars and derived classes appear to be stored as LLPointer<LLViewerObject> in a lot of cases, so non-virtual ~LLViewerObject() might be triggered by LLPointer and end up not cleaning sInstances in some cases (animeshes specific?), thus causing broken pointers in sInstances.

following promotion of DRTVWR-497

Depends onto SL-13979 for proper logging

LLSingleton depends onto logging system, having logging system be based on LLSingleton causes crashes and deadlocks

Due to conflicts picked up ptolemy's fix manually

following promotion of DRTVWR-503

Character lights injected during render pass while in character edit mode
(i.e. mSpecialRenderMode == 3) were causing discrepencies between deferred
(ALM) and forward alpha blend lighting.

Notifications were cleaned up by this point and were pulling in LLUI

Contribution from Ansariel Hiller

Removed some potential div-by-0 NaNs and a mangled clamp.