Test that we can cope with broken unwind information that suggests
reading out of bounds.

RUN: yaml2obj %S/Inputs/broken-unwind.exe.yaml -o %T/broken-unwind.exe
RUN: yaml2obj %S/Inputs/broken-unwind.dmp.yaml -o %T/broken-unwind.dmp
RUN: %lldb -O "settings set target.exec-search-paths %T" \
RUN:   -c %T/broken-unwind.dmp -o "image show-unwind -a 0xb1000" -o exit