report_r_debug: handle `-z separate-code' and find more modules
Looking at some cores in eu-stack, I found that they were not being
backtraced.
This was because elfutils had not found some modules (e.g. libc-2.22.so)
in report_r_debug.
That is because it has a limit on the number of link map entries it will
look at, to avoid loops in corrupted core files.
The example I found had:
- 36 elements
- 109 iterations
See also discussion here:
https://sourceware.org/pipermail/elfutils-devel/2023q2/006149.html
Signed-off-by: Luke Diamand <ldiamand@roku.com>
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