fix a flaw LLViewerOctreeEntry::mVisible not initialized.
fix a flaw LLViewerOctreeEntry::mVisible not initialized.

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm