Memory manager fix for llvm 3.3
Memory manager fix for llvm 3.3

DefaultJITMemoryManager crashes on arm, but the 3.3 path works,
so I introduced ifdefs to select between them.

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