proc: add support for dwz compressed DWARF
'dwz' is a tool that reduces the size of DWARF sections by deduplicating symbols. The deduplicated symbols are moved from their original 'compile unit' to a 'partial unit', which is then referenced from its original location with an 'imported unit' tag. In the case of Go binaries, all symbols are located in a single 'compile unit', and the name of each symbol contains a reference to its package, so 'dwz' is not able to deduplicate them. But still, some C symbols included in the binary are deduplicated, which also alters the structure of the DWARF sections, making delve unable to parse them (crashing in the attempt). While it would've been possible to simply ignore the C symbols, or blindly loading all then into BinaryInfo members (packageVars, Functions...), for correctness sake this change tries to do the right thing, staging symbols into temporary partialUnit objects, moving them to BinaryInfo when they are actually requested by a 'imported unit' tag.
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