aha! I forgot that in the elf we have it compiled to 0x0 and then we relocate to either 0x6xxx or 0x9xxx at load time. So the correct lookup there is info line *0x1aa4b:
(gdb) info line *0x1aa4b
No line number information available for address
0x1aa4b <_SM20scala.DummyImplicit$G4load+18>
And for that one right above you've got $pc at 0x292b8:
(gdb) info line *0x292b8
Line 33 of "dependencies/nativelib_native0.5.0-SNAPSHOT_3-0/scala-native/gc/immix/Marker.c" starts at address 0x292b2 <Marker_Mark+242>
and ends at 0x292bc <Marker_Mark+252>.