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Revision 39302

  • vm_dump: FreeBSD ports' libexecinfo's backtrace(3) can't trace
    beyond signal trampoline, and as described in r38342 it can't
    trace on -O because it see stack frame pointers.
    libunwind unw_backtrace see dwarf information in the binary
    and it works with -O (without frame pointers).

  • configure.in: remove r38342's hack and check libunwind.