Add SPIRV-Tools file source/opt/insert_extract_elim.cpp
Add SPIRV-Tools file source/opt/insert_extract_elim.cpp

antiagainst/shaderc,antiagainst/shaderc,dneto0/shaderc,antiagainst/shaderc,dneto0/shaderc,dneto0/shaderc,dneto0/shaderc,antiagainst/shaderc