Promote pointers passed via Kernarg to point to the global address space #145
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This is applies a trivial optimisation which follows from the language invariants established by HC and HIP: since a pointer passed to a kernel can only point to the global address space, it is suboptimal to not expose that information to the BE. Note that the pass is quite minimalistic and does not attempt to walk down an indirection chain / a nested data structure - it only applies to direct arguments.