Many small code cleanups

indra/llcommon/StackWalker.cpp

indra/llcommon/lltracerecording.cpp

indra/llcommon/lltracethreadrecorder.cpp

indra/llfilesystem/llfilesystem.cpp

indra/llinventory/llparcelflags.h

indra/llmessage/llcoproceduremanager.cpp

indra/llmessage/llpacketring.cpp

indra/llmessage/llxfer_file.cpp

indra/llprimitive/lldaeloader.cpp

indra/llxml/llcontrol.cpp

indra/newview/llappearancemgr.cpp

indra/newview/llappviewer.cpp

indra/newview/llmediadataclient.cpp

indra/newview/llmeshrepository.cpp

indra/newview/llpreviewtexture.cpp