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Piotr Kubaj
c4fde87a32
Without it, LLVM libunwind doesn't know where to stop when unwinding the
main thread, so it uses a stale LR as the return address and crashes.
Our libunwind doesn't do that since 5866c369e4 reverted it, but
programs that bundle their own copy, like ClickHouse, are hit by it.
amd64, arm64, i386 and riscv already have the same annotation.
Approved by: jhibbits
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D60740