proc: refactor dwarf function information loading (#1685)
proc: refactor dwarf function information loading (#1685)

Splits the code that loads function information from debug_info into
multiple functions.
This makes the changes needed to implement logical breakpoints easier
to make.
go-delve/delve,alexbrainman/delve,derekparker/delve,go-delve/delve,go-delve/delve,alexbrainman/delve,alexbrainman/delve,go-delve/delve,aarzilli/delve,derekparker/delve,aarzilli/delve,aarzilli/delve,aarzilli/delve,derekparker/delve,go-delve/delve