It also adds a DW_LNE_set_discriminator
check. I don't know if there is much to check here, I don't fully
understand why they are needed in the first place.
Found the background information on discriminators:
http://wiki.dwarfstd.org/index.php?title=Path_Discriminators
So, it is basically about recognizing different basic blocks
that share the same file/line/column info for profilers.
Cheers,
Mark