[libunwind] Tweak tests for musl support. (#85097)
We can't use `dladdr()` in the tests, because when we're statically
linking with musl that function is a no-op.
Additionally, because musl disables emission of unwind information in
its build, and because its signal trampolines don't include unwind
information, tests that involve unwinding through a signal handler won't
work and need to be disabled for musl.
rdar://123436891
NOKEYCHECK=True
GitOrigin-RevId: fe1301b5d846e96655ae6981789f677de6c7572d
4 files changed
