Add a tool to convert kernel minidump to elf coredump

[minsoochoo0122_proton.me]

Summary

Add a tool that converts a given kernel minidump to elf coredump format
so that gdb or lldb can directly read this instead of learning about
the special format.

submitted by: Bora Ozarslan [e-mail]

[borako.ozarslan_gmail.com]

Added a man page

[emaste]

tools/tools/minidump_to_elf/minidump-to-elf.1

1

Copy-pasteo

[emaste]

tools/tools/minidump_to_elf/main.c

152

we may want to avoid modifying libkvm (we can just open the kernel again and call elf_begin).

[minsoochoo0122_proton.me]

I can take this once my work on LLDB is done (probably in April). I think this is mostly complete although there are some places that need fixes or improvements. Phab shows the author has been inactive for a long time, so I'll take this unless I hear back from the author.

[emaste]

Bora was a co-op student at the time of this submission, and I don't believe is using FreeBSD any longer.

[minsoochoo0122_proton.me]

Author isn't working on this anymore so I'm taking control of this revision.

[minsoochoo0122_proton.me]

Abandoning in favour of D56250 and D56256