Add printing of file names and line numbers in stacktraces
Uses DWARF ¾/5 .debug_line section (originally intended
to only support DWARF 5, but GCC emits lower versioned sections
regardless of command line arguments on some platforms for some
reason, so generic support it is).
Also adds a whole lot of definitions for various DWARF constants
I expect to be useful in the future.
The quickest way to test this probably is to run test fault1
in kernel console.
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