Improve perf of GLSL uniform lookups by name

indra/llcommon/llstringtable.h

indra/llrender/llglslshader.cpp

indra/llrender/llglslshader.h

indra/llrender/llpostprocess.cpp

indra/llrender/llpostprocess.h

indra/newview/lldrawpoolavatar.cpp

indra/newview/lldrawpoolbump.cpp

indra/newview/lldrawpoolterrain.cpp

indra/newview/lldrawpoolwater.cpp

indra/newview/lldrawpoolwlsky.cpp

indra/newview/llface.cpp

indra/newview/llmaniptranslate.cpp

indra/newview/llviewershadermgr.cpp

indra/newview/llviewershadermgr.h

indra/newview/llwaterparammanager.cpp

indra/newview/llwlparammanager.cpp

indra/newview/pipeline.cpp