Moved hpvm pass tests (.ll files) into the same folder

hpvm/test/hpvm_pass/BuildDFG/AllocationNode.ll

hpvm/test/hpvm_pass/BuildDFG/CreateNode.ll

hpvm/test/hpvm_pass/BuildDFG/CreateNodeAndEdge.ll

hpvm/test/hpvm_pass/BuildDFG/LeafBindEdge.ll

hpvm/test/hpvm_pass/BuildDFG/LeafInComingBindEdge.ll

hpvm/test/hpvm_pass/BuildDFG/LeafNodeGetters.ll

hpvm/test/hpvm_pass/BuildDFG/OneRoot.ll

hpvm/test/hpvm_pass/BuildDFG/ThreeLevel.ll

hpvm/test/hpvm_pass/BuildDFG/ThreeLevelEdge.ll

hpvm/test/hpvm_pass/BuildDFG/TwoLaunch.ll

hpvm/test/hpvm_pass/BuildDFG/TwoLevel.ll

hpvm/test/hpvm_pass/BuildDFG/TwoLevelGraph.ll

hpvm/test/hpvm_pass/ClearDFG/ThreeLevel.CPU.ll

hpvm/test/hpvm_pass/ClearDFG/ThreeLevel.OpenCLToCPU.ll

...est/hpvm_pass/ClearDFG/ThreeLevel.constmem.OpenCLToCPU.ll

hpvm/test/hpvm_pass/DFG2LLVM_CPU/OneLevel.codeGen.ll

hpvm/test/hpvm_pass/DFG2LLVM_CPU/OneRootBasic.ll

hpvm/test/hpvm_pass/DFG2LLVM_CPU/ThreeLevel.OpenCL.ll

hpvm/test/hpvm_pass/DFG2LLVM_CPU/ThreeLevel.codeGen.ll

hpvm/test/hpvm_pass/DFG2LLVM_CPU/ThreeLevel.cond.ll