[llvm] [BOLT][DWARF] Add support for .debug_names (PR #81062)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

> > Any reason for creating `DebugNames` under `Core` and not under `Rewrite`?
> 
> Well it's not a re-writer it's a supporting data structure. I viewed it similar to DIEBuilder, DebugData

We've discussed the file placement offline. We'll need a separate PR to move `DebugNames` out of `\Core` as Alexander ran into a circular dependency issue while trying to do so.

https://github.com/llvm/llvm-project/pull/81062