SL-16166 Optimization pass on LLRenderPass::pushBatch

indra/llrender/llgltexture.h

indra/llrender/llrender.cpp

indra/llrender/llrender.h

indra/llrender/lltexture.h

indra/llrender/llvertexbuffer.cpp

indra/llrender/llvertexbuffer.h

indra/newview/lldrawpool.cpp

indra/newview/lldrawpoolmaterials.cpp

indra/newview/lldrawpoolsimple.cpp

indra/newview/lldrawpooltree.cpp

indra/newview/llspatialpartition.h

indra/newview/llviewertexture.cpp

indra/newview/pipeline.cpp

indra/newview/pipeline.h