||Remove edge (fo) from Figure B.2
Section B.2, pg 278
Page 280 describes the (fo) link is described as "The operand of the
DW_OP_call_ref DWARF expression operator is the offset of a debugging
information entry in the debug_info.dwo section of another compilation
unit. Similar for attribute operands that use DW_FORM_ref_addr."
"I think the (fo) link is not possible right now (there's no way to
compute cross-CU references currently, they would require the packaging
tool to fixup the offsets, which is an anti-goal) -
for more context on that."
It's also unclear how two CUs would be produced in a single DWO (to allow
a cross-unit reference between them to be produced, ignoring how that would
be handled during packaging/DWP creation).
Remove (fo) from Figure B.2 and the associated list of edge descriptions
that follows/is part of the figure.