SE-0419: Swift Backtracing API

It's true that most Linux distributions are not building their system libraries with frame pointers at the moment but this seems to be changing. Fedora has already changed to building everything with frame pointers. Similarly, Ubuntu is enabling frame pointers by default starting with Ubuntu 24.04. Both posts outline the motivation quite strongly in that they aim to enable high performance profiling. Additionally, usage data has shown that enabling frame pointers has negligible performance impacts and the utilities of performance profiling outweigh those easily.
In line with this, we have already enabled building the Swift runtime libraries with frame pointers and we have made Swift PM build with frame pointers by default as well.

Of course there are still environments out there were frame pointers are not available but we do see a large trend towards making them a default in most major distributions.