Get source lines for public symbol which are labels

[calixteman]

Some public symbols correspond to labels in assembly code.
Right now they're just dumped as PUBLIC with no source lines information.
But in looking the label symbols they're corresponding, it seems that we could get some source line info for them.
For example we have:
PUBLIC 978b40 dav1d_msac_decode_symbol_adapt4_sse2
And the first line returned from the source info is:
https://searchfox.org/mozilla-central/source/third_party/dav1d/src/x86/msac.asm#85

[gabrielesvelto]

But in looking the label symbols they're corresponding, it seems that we could get some source line info for them.

That'd be sweet.