for SH-3350 and SH-3353: Report frame-to-frame visual deltas as an LLStat

..._settings/shaders/class1/interface/onetexturefilterF.glsl

..._settings/shaders/class1/interface/onetexturefilterV.glsl

...settings/shaders/class1/interface/twotexturecompareF.glsl

indra/newview/llscenemonitor.cpp

indra/newview/llscenemonitor.h

indra/newview/llspatialpartition.cpp

indra/newview/llspatialpartition.h

indra/newview/llviewershadermgr.cpp

indra/newview/llviewershadermgr.h

indra/newview/pipeline.cpp