Mark files with duplicated debuggee entries as corrupt
Since we do not (yet) support tracking child processes, a data
file with two or more debuggee entries (lines starting with 'X')
has to be corrupt. I have no clue yet how one can generate those,
but for sure the data will be completely bogus and can trigger
all sorts of issues. Most notably, the backtraces will be randomly
broken and potentially even recursive then...
CCBUG: 392085