Prevent unwinding through stack bottom (#81770)

Prevent unwinding through stack bottom (#81770)

When processing unhandled exception on the most recent Alpine 3.17,
the libunwind doesn't stop at the bottom
frame of the main thread (the caller of `main`) and tries to unwind
further. The reason is that the method is missing dwarf unwind
information, so the libunwind falls back to using RBP chain, but the RBP
points to a garbage and so it ends up crashing with SIGSEGV.

While the missing DWARF unwind info seems to be a bug in the Alpine 3.17
(older ones work fine), we can prevent issues like this by stopping at
the hosting API boundary and not trying to unwind past that. This is
what this PR does.