Previously, we would only resolve libraries from `/usr/lib`, which is
not the only path from which the crashed process could've loaded the
libraries from.
The first line was creating a StringView object with region name. Then,
if the path didn't start with '/', it had assigned a String made from a
temporary LexicalPath join result.
This fixes the bug that only main executable's frames were displayed.
Previously we rejected all entries from Loader.so even if the faulting
address was located in it, i.e. the actual issue was with the dynamic
loader. We no longer do that to make debugging Loader crashes easier.
Our Clang toolchain uses versioned names for its shared libraries,
meaning that our applications link against `libc++.so.1.0`, not simply
`libc++.so`. Without this change, the LLVM runtime libraries are
excluded from backtraces, which makes debugging toolchain issues harder.
Some coredumps take a long time to symbolicate, so let's show a simple
window with a progress bar while they are loading.
I'm not super happy with the factoring of this feature, but it's an
absolutely kickass feature that makes crashing feel 100% more responsive
than before, since you now get GUI feedback almost immediately after a
crash occurs. :^)
