e mapping program counters to line numbers.
</p>
<p>
In Go 1.1 and earlier, each function (represented by a Func) had its own LineTable,
and the line number corresponded to a numbering of all source lines in the
program, across all files. That absolute line number would then have to be
converted separately to a file name and line number within the file.
</p>
<p>
In Go 1.2, the format of the data changed so that there is a single LineTable
for the entire program, shared by all Funcs, and there are no absolut