Added correctness test for GLSL varying attributes.
Added correctness test for GLSL varying attributes.

tdenniston/Halide,psuriana/Halide,lglucin/Halide,gchauras/Halide,gchauras/Halide,rodrigob/Halide,aam/Halide,tdenniston/Halide,lglucin/Halide,kenkuang1213/Halide,ayanazmat/Halide,jiawen/Halide,dougkwan/Halide,kgnk/Halide,ronen/Halide,adasworks/Halide,kgnk/Halide,ronen/Halide,fengzhyuan/Halide,dan-tull/Halide,dougkwan/Halide,dougkwan/Halide,ronen/Halide,dan-tull/Halide,smxlong/Halide,mcanthony/Halide,ayanazmat/Halide,myrtleTree33/Halide,myrtleTree33/Halide,kenkuang1213/Halide,dougkwan/Halide,dougkwan/Halide,mcanthony/Halide,lglucin/Halide,tdenniston/Halide,aam/Halide,lglucin/Halide,adasworks/Halide,damienfir/Halide,gchauras/Halide,aam/Halide,rodrigob/Halide,kenkuang1213/Halide,delcypher/Halide,dan-tull/Halide,fengzhyuan/Halide,kgnk/Halide,kgnk/Halide,rodrigob/Halide,delcypher/Halide,adasworks/Halide,ayanazmat/Halide,jiawen/Halide,smxlong/Halide,aam/Halide,tdenniston/Halide,dan-tull/Halide,ayanazmat/Halide,mcanthony/Halide,ayanazmat/Halide,aam/Halide,fengzhyuan/Halide,mcanthony/Halide,delcypher/Halide,delcypher/Halide,rodrigob/Halide,myrtleTree33/Halide,ayanazmat/Halide,rodrigob/Halide,lglucin/Halide,fengzhyuan/Halide,myrtleTree33/Halide,jiawen/Halide,dan-tull/Halide,ayanazmat/Halide,tdenniston/Halide,damienfir/Halide,ronen/Halide,kenkuang1213/Halide,jiawen/Halide,adasworks/Halide,delcypher/Halide,delcypher/Halide,gchauras/Halide,jiawen/Halide,kgnk/Halide,ayanazmat/Halide,aam/Halide,dougkwan/Halide,delcypher/Halide,kgnk/Halide,mcanthony/Halide,kenkuang1213/Halide,psuriana/Halide,dan-tull/Halide,ronen/Halide,rodrigob/Halide,dougkwan/Halide,dougkwan/Halide,psuriana/Halide,myrtleTree33/Halide,damienfir/Halide,tdenniston/Halide,smxlong/Halide,jiawen/Halide,damienfir/Halide,rodrigob/Halide,smxlong/Halide,smxlong/Halide,fengzhyuan/Halide,adasworks/Halide,rodrigob/Halide,mcanthony/Halide,mcanthony/Halide,smxlong/Halide,delcypher/Halide,adasworks/Halide,kenkuang1213/Halide,kgnk/Halide,lglucin/Halide,adasworks/Halide,myrtleTree33/Halide,fengzhyuan/Halide,dan-tull/Halide,fengzhyuan/Halide,gchauras/Halide,psuriana/Halide,damienfir/Halide,aam/Halide,kenkuang1213/Halide,jiawen/Halide,adasworks/Halide,dan-tull/Halide,psuriana/Halide,psuriana/Halide,psuriana/Halide,smxlong/Halide,tdenniston/Halide,ronen/Halide,fengzhyuan/Halide,myrtleTree33/Halide,ronen/Halide,damienfir/Halide,kgnk/Halide,lglucin/Halide,mcanthony/Halide,damienfir/Halide,damienfir/Halide,tdenniston/Halide,smxlong/Halide,myrtleTree33/Halide,kenkuang1213/Halide,ronen/Halide,gchauras/Halide