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Add DevicePtr parameterized on address space #84
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Optimize loads and stores using LLVM.jl.
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This PR refactors a core part of CUDAnative: how pointers are represented, and how they are accessed. It introduces a
DevicePtrstruct (Ptr+ AS) with (WIP) intrinsics for accessing memory, specialized on the address space. The type is used inCuDeviceArray, makinggetindexfaster for global loads (which LLVM couldn't figure out).unsafe_store!fixes #79