Fix broken compilation due to the removal of _fp16 user defined literal operator.
Fix broken compilation due to the removal of _fp16 user defined literal
operator.

kgnk/Halide,jiawen/Halide,smxlong/Halide,dan-tull/Halide,ronen/Halide,psuriana/Halide,dougkwan/Halide,mcanthony/Halide,tdenniston/Halide,myrtleTree33/Halide,ronen/Halide,kenkuang1213/Halide,kenkuang1213/Halide,adasworks/Halide,jiawen/Halide,kgnk/Halide,delcypher/Halide,mcanthony/Halide,kenkuang1213/Halide,dougkwan/Halide,mcanthony/Halide,mcanthony/Halide,jiawen/Halide,kenkuang1213/Halide,myrtleTree33/Halide,delcypher/Halide,fengzhyuan/Halide,adasworks/Halide,fengzhyuan/Halide,dan-tull/Halide,myrtleTree33/Halide,kgnk/Halide,dan-tull/Halide,kenkuang1213/Halide,adasworks/Halide,delcypher/Halide,myrtleTree33/Halide,ronen/Halide,mcanthony/Halide,psuriana/Halide,dougkwan/Halide,mcanthony/Halide,adasworks/Halide,myrtleTree33/Halide,tdenniston/Halide,ronen/Halide,smxlong/Halide,kgnk/Halide,adasworks/Halide,delcypher/Halide,psuriana/Halide,fengzhyuan/Halide,tdenniston/Halide,tdenniston/Halide,smxlong/Halide,myrtleTree33/Halide,kgnk/Halide,dan-tull/Halide,fengzhyuan/Halide,dan-tull/Halide,psuriana/Halide,jiawen/Halide,fengzhyuan/Halide,delcypher/Halide,kgnk/Halide,dougkwan/Halide,psuriana/Halide,tdenniston/Halide,delcypher/Halide,tdenniston/Halide,dan-tull/Halide,adasworks/Halide,smxlong/Halide,adasworks/Halide,smxlong/Halide,smxlong/Halide,jiawen/Halide,kenkuang1213/Halide,dougkwan/Halide,tdenniston/Halide,ronen/Halide,dougkwan/Halide,fengzhyuan/Halide,mcanthony/Halide,tdenniston/Halide,jiawen/Halide,mcanthony/Halide,psuriana/Halide,adasworks/Halide,ronen/Halide,dougkwan/Halide,dan-tull/Halide,kgnk/Halide,kgnk/Halide,dan-tull/Halide,fengzhyuan/Halide,myrtleTree33/Halide,delcypher/Halide,ronen/Halide,smxlong/Halide,myrtleTree33/Halide,delcypher/Halide,fengzhyuan/Halide,kenkuang1213/Halide,psuriana/Halide,dougkwan/Halide,smxlong/Halide,ronen/Halide,jiawen/Halide,kenkuang1213/Halide