[PATCH] Avoid segfault on invalid directory table

[Padraig Brady]

gdb was segfaulting during backtrace on a binary here,
where fe->dir_index parsed from the dwarf info was seen to
access beyond the provided include_dirs array.
The attached bounds the access to entries actually written to the array,
and was verified to output the backtrace correctly.

cheers,
Pádraig
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