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[RFA] Patch for dwarf2read.c to handle ref_addr in more places


This patch allows us to follow die references that are in a seperate
compilation unit.
It's the first part of what is needed to handle multiple CU's that are
generated by the patch i sent to gcc-patches yesterday.

We only get absolute references in sibling's and type's, so that's
where i handle them.

Without this patch, you'll get "Can't find reference at offset
<whatever>" if the type or sibling is in another CU.

Next up is actual handling of multiple compilation units.


--Dan


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