[llvm] [RFC] Emit dwarf data for signature-changed or new functions (PR #157349)

[David Faust via llvm-commits]

dafaust wrote:

Having refreshed my mind on all the various discussions on this topic, the format in #127855 and now in #165310 is good and we should proceed with it.

> Thanks @dafaust. I cannot fully understand what dwarf 5 (or 6) recommendation for changed signature. An example will be the best.

To be clear - I don't think there is any such recommendation from dwarf spec.  For the inter-procedural constant propagation transformations GCC currently generates some dwarf reflecting the constprop specialized versions of a changed function (e.g. "foo" -> "foo.constprop") like the example in my first comment above. I was just thinking about whether something similar to that could be adapted to reflect other transformations also.

But that is all extraneous :)  Sorry for the noise.
We should rather move forward with #165310




https://github.com/llvm/llvm-project/pull/157349