Merge 1b894864862d8049e4a2567a472efdc2eda1e035 into 18.x

[brad0]

[llvm-objdump] Add support for the PT_OPENBSD_SYSCALLS
segment type. (#82121)

Reference: https://github.com/openbsd/src/blob/master/sys/sys/exec_elf.h

[brad0]

/cherry-pick 1b89486

[llvmbot]

/pull-request #82317

[llvmbot]

@llvm/issue-subscribers-tools-llvm-objdump

Author: Brad Smith (brad0)

[llvm-objdump] Add support for the PT_OPENBSD_SYSCALLS segment type. (#82121)

Reference: https://github.com/openbsd/src/blob/master/sys/sys/exec_elf.h