Use SIMD variant of uuid null check

indra/llaudio/llaudioengine.cpp

indra/newview/llagent.cpp

indra/newview/llavataractions.cpp

indra/newview/llfavoritesbar.cpp

indra/newview/llfloaterconversationpreview.cpp

indra/newview/llfloaterimcontainer.cpp

indra/newview/llfloaterinspect.cpp

indra/newview/llfloaterpreference.cpp

indra/newview/llgroupactions.cpp

indra/newview/llgroupmgr.cpp

indra/newview/llinventorybridge.cpp

indra/newview/llinventoryfilter.cpp

indra/newview/llinventorymodel.cpp

indra/newview/llinventoryobserver.cpp

indra/newview/llinventorypanel.cpp

indra/newview/llpanelgroup.cpp

indra/newview/llpanelgroupexperiences.cpp

indra/newview/llpanelgroupgeneral.cpp

indra/newview/llpanelgroupinvite.cpp

indra/newview/llpanelobject.cpp