[libcxxabi] [lldb] [llvm] [lldb] Add new per-language frame-format variables for formatting function names (PR #131836)

[Michael Buch via llvm-commits]

Michael137 wrote:

Also another open question is whether we should `${function.name-with-args}` for this or introduce a new format variable, e.g., `${function.name-formatted}`. @JDevlieghere was looking into implementing a "fallback" operator for `{}` scopes. With that we could make the default `frame-format`:
```
{ ${name-formatted} || ${function.name-with-args }
```
(depending on the "fallback" syntax)

https://github.com/llvm/llvm-project/pull/131836